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O

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  1. O Street Market
  2. O'Bannon Homestead
  3. O'Bannon Mill
  4. O'Blenis House
  5. O'Brien County Courthouse
  6. O'Brien Electric Priming Company
  7. O'Brien General Store and Post Office
  8. O'Brien–Peuschel Farmstead
  9. O'Connor House (St. Thomas, North Dakota)
  10. O'Connor–Proctor Building
  11. O'Dea House (Berwyn Heights, Maryland)
  12. O'Donel House and Farm
  13. O'Donnell Building
  14. O'Donnell House (Sumter, South Carolina)
  15. O'Fallons Bluff
  16. O'Hanlon Building
  17. O'Hara Waltham Dial factory
  18. O'Kane Building
  19. O'Kane Market and O'Kane Building
  20. O'Kane-Jacobs House
  21. O'Kelly's Chapel
  22. O'Leno State Park
  23. O'Neill Site
  24. O'Reilly House
  25. O'Shaughnessy Dam (Ohio)
  26. O'Shea Building
  27. O. Arthur Kirkman House and Outbuildings
  28. O. B. McFadden House
  29. O. C. Barber Barn No. 1
  30. O. C. Barber Colt Barn
  31. O. C. Barber Creamery
  32. O. C. Barber Machine Barn
  33. O. C. Barber Piggery
  34. O. E. Payne House
  35. O. E. Rolvaag House
  36. O. E. Walker House
  37. O. F. Short House
  38. O. H. Booth Hose Company
  39. O. Henry Hall
  40. O. J. Daniels House
  41. O. K. Palmer House
  42. O. T. Bassett Tower
  43. O. W. Gardner House
  44. O.A.E. Blyberg House
  45. O.B. Grant House
  46. O.D. Gunn Trade and Sale Barn
  47. O.F. and Lulu E. Fryer House
  48. O.H.P. Tanner House
  49. O.J. Walker
  50. O.L. Dunaway House
  51. O.M. Edwards Building
  52. O.P. Wickham House
  53. OK Theatre
  54. OTO Homestead and Dude Ranch
  55. Oahu Railway and Land Company
  56. Oak Alley Plantation
  57. Oak Ballroom
  58. Oak Cemetery
  59. Oak Circle Historic District
  60. Oak City Christian Church
  61. Oak Creek Parkway
  62. Oak Crest
  63. Oak Dell
  64. Oak Flat (Arizona)
  65. Oak Forest (Mechanicsville, Virginia)
  66. Oak Glen (Portsmouth, Rhode Island)
  67. Oak Grove (Altavista, Virginia)
  68. Oak Grove (Church Hill, Mississippi)
  69. Oak Grove (Eastville, Virginia)
  70. Oak Grove (Erwin, North Carolina)
  71. Oak Grove (Hampton County, South Carolina)
  72. Oak Grove (La Plata, Maryland)
  73. Oak Grove (Manakin-Sabot, Virginia)
  74. Oak Grove Butterfield Stage Station
  75. Oak Grove Cemetery (Conway, Arkansas)
  76. Oak Grove Cemetery (Des Arc, Arkansas)
  77. Oak Grove Cemetery (Fall River, Massachusetts)
  78. Oak Grove Cemetery (Falmouth, Massachusetts)
  79. Oak Grove Cemetery (Gloucester, Massachusetts)
  80. Oak Grove Cemetery (New Bedford, Massachusetts)
  81. Oak Grove Community House
  82. Oak Grove Farm
  83. Oak Grove Methodist Church
  84. Oak Grove Missionary Baptist Church
  85. Oak Grove Rosenwald School
  86. Oak Grove School (Grant County, Arkansas)
  87. Oak Grove School (Prairieville, Alabama)
  88. Oak Grove School (Winston-Salem, North Carolina)
  89. Oak Hall (Brentwood, Tennessee)
  90. Oak Hall (Bunkie, Louisiana)
  91. Oak Hall Historic District
  92. Oak Hill (Annandale, Virginia)
  93. Oak Hill (Calvert City, Kentucky)
  94. Oak Hill (Chillicothe, Ohio)
  95. Oak Hill (Colonial Heights, Virginia)
  96. Oak Hill (Cumberland, Virginia)
  97. Oak Hill (Delaplane, Virginia)
  98. Oak Hill (James Monroe house)
  99. Oak Hill (Linlithgo, New York)
  100. Oak Hill Cemetery (Bartow, Florida)
  101. Oak Hill Cemetery (Birmingham, Alabama)
  102. Oak Hill Cemetery (Cedar Rapids, Iowa)
  103. Oak Hill Cemetery (Evansville, Indiana)
  104. Oak Hill Cemetery (Lawrence, Kansas)
  105. Oak Hill Cemetery (Lebanon, Indiana)
  106. Oak Hill Cemetery (Lewistown, Illinois)
  107. Oak Hill Cemetery (Newnan, Georgia)
  108. Oak Hill Cemetery (Oak Hill, New York)
  109. Oak Hill Cemetery (Pontiac, Michigan)
  110. Oak Hill Cemetery Chapel (Bellows Falls, Vermont)
  111. Oak Hill Cemetery Chapel (Washington, D.C.)
  112. Oak Hill Cottage
  113. Oak Hill Country Club
  114. Oak Hill Estate
  115. Oak Hill Farm
  116. Oak Hill Historic District (Fort Dodge, Iowa)
  117. Oak Hill Historic District (Hagerstown, Maryland)
  118. Oak Hill Historic District (Oak Hill, Alabama)
  119. Oak Hill Mausoleum
  120. Oak Hill Methodist Episcopal Church
  121. Oak Hill Park Historic District
  122. Oak Hill School House
  123. Oak Hill Welsh Congregational Church
  124. Oak Hill station
  125. Oak Hills, Oregon
  126. Oak Island (South Carolina)
  127. Oak Island Life Saving Station
  128. Oak Island Light
  129. Oak Knoll (Winchester, Massachusetts)
  130. Oak Lane Historic District
  131. Oak Lawn (Charlottesville, Virginia)
  132. Oak Lawn (Huntsboro, North Carolina)
  133. Oak Lawn (Madison Heights, Virginia)
  134. Oak Lawn (Ridgely, Maryland)
  135. Oak Lawn Farm Dairy Barn
  136. Oak Lawn Methodist Episcopal Church, South
  137. Oak Lodge
  138. Oak Park Conservatory
  139. Oak Park Historic District
  140. Oak Park Village Hall
  141. Oak Place (Huntsville, Alabama)
  142. Oak Plain Presbyterian Church
  143. Oak Ridge (Danville, Virginia)
  144. Oak Ridge Apartments
  145. Oak Ridge Cemetery
  146. Oak Ridge Historic District
  147. Oak Ridge Military Academy
  148. Oak Ridge Railroad Overpass
  149. Oak Ridge gatehouses
  150. Oak Spring Farm
  151. Oak Square School
  152. Oak Street Garage
  153. Oak Street School (Fulton, New York)
  154. Oak Top
  155. Oakcliff
  156. Oakdale (Floyd, Virginia)
  157. Oakdale (Pennsbury Township, Pennsylvania)
  158. Oakdale Cemetery (Hendersonville, North Carolina)
  159. Oakdale Cotton Mill Village
  160. Oakdale Historic District
  161. Oakdale Manor
  162. Oakdale Memorial Gardens
  163. Oakdale Public School
  164. Oakdale School (Madison, Indiana)
  165. Oakdale Village Historic District
  166. Oakdene (Staunton, Virginia)
  167. Oakenshawe Historic District
  168. Oakes Estate
  169. Oakes National Bank Block
  170. Oakes Post Office
  171. Oakes-Wood House
  172. Oakey Streak Methodist Episcopal Church
  173. Oakfield station
  174. Oakforest
  175. Oakham Center Historic District
  176. Oakham Farm
  177. Oakhill (Marshall, Michigan)
  178. Oakhurst (Emelle, Alabama)
  179. Oakhurst Historic District
  180. Oakhurst Links
  181. Oakhurst–Gildersleeve Neighborhood Historic District
  182. Oaklana
  183. Oakland (9 Oakhurst Drive, Natchez, Mississippi)
  184. Oakland (Airlie, North Carolina)
  185. Oakland (Bryantown, Maryland)
  186. Oakland (El Dorado, Arkansas)
  187. Oakland (Gallatin, Tennessee)
  188. Oakland (Montpelier, Virginia)
  189. Oakland (Parkersburg, West Virginia)
  190. Oakland Avenue Historic District
  191. Oakland Cemetery (Atlanta)
  192. Oakland Cemetery (Camden, Arkansas)
  193. Oakland Cemetery (Fort Dodge, Iowa)
  194. Oakland Cemetery (Princeton, Illinois)
  195. Oakland Cemetery (Trenton, Tennessee)
  196. Oakland City Hall
  197. Oakland Farm
  198. Oakland Grove Presbyterian Church
  199. Oakland Hall
  200. Oakland Historic District (Oakland, Maryland)
  201. Oakland Historic District (Oakland, Oregon)
  202. Oakland Hotel
  203. Oakland Memorial Chapel
  204. Oakland Mill
  205. Oakland Mills Blacksmith House and Shop
  206. Oakland Mills Bridge
  207. Oakland Park Elementary School
  208. Oakland Plantation (Beech Island, South Carolina)
  209. Oakland Plantation (Carvers, North Carolina)
  210. Oakland Plantation (Fort Motte, South Carolina)
  211. Oakland Plantation (Natchitoches Parish, Louisiana)
  212. Oakland Plantation (Tarboro, North Carolina)
  213. Oakland Plantation House (Gurley, Louisiana)
  214. Oakland Plantation House (Mount Pleasant, South Carolina)
  215. Oakland Presbyterian Church
  216. Oakland Public Library (Oakland, Maine)
  217. Oakland Public School
  218. Oakland station (Maryland)
  219. Oakland, Rhode Island
  220. Oakland-Fraternal Cemetery
  221. Oaklandon Historic District
  222. Oaklands (Gardiner, Maine)
  223. Oaklands (West Whiteland Township, Pennsylvania)
  224. Oaklands Historic House Museum
  225. Oakland–Dousman Historic District
  226. Oaklawn (Huntsville, Alabama)
  227. Oaklawn Cemetery
  228. Oaklawn Farm
  229. Oaklawn Garden
  230. Oaklawn Manor
  231. Oaklawn Plantation (Natchez, Louisiana)
  232. Oaklawn, Rhode Island
  233. Oakleigh Garden Historic District
  234. Oakleigh Historic Complex (Mobile, Alabama)
  235. Oaklette Historic District
  236. Oakley (Gallatin, Tennessee)
  237. Oakley (Heathsville, Virginia)
  238. Oakley (Spotsylvania County, Virginia)
  239. Oakley (Upperville, Virginia)
  240. Oakley Chapel African Methodist Episcopal Church
  241. Oakley Farm (Warm Springs, Virginia)
  242. Oakley High School Stadium
  243. Oakley Hill
  244. Oakley, Idaho
  245. Oaklyn Plantation
  246. Oakmont (Greenville, North Carolina)
  247. Oakmont Country Club
  248. Oakridge (Blackstone, Virginia)
  249. Oaks Cloister
  250. Oaks Hotel
  251. Oaks II
  252. Oakslea Place
  253. Oakton Gables
  254. Oakton Historic District
  255. Oakton Trolley Station
  256. Oakwood (Fauquier County, Virginia)
  257. Oakwood (Fayette, Missouri)
  258. Oakwood (Gadsden, South Carolina)
  259. Oakwood (Harwood, Maryland)
  260. Oakwood Avenue Presbyterian Church
  261. Oakwood Cemetery (Austin, Texas)
  262. Oakwood Cemetery (Fort Worth, Texas)
  263. Oakwood Cemetery (Niagara Falls, New York)
  264. Oakwood Cemetery (Troy, New York)
  265. Oakwood Cemetery Chapel (Allegan, Michigan)
  266. Oakwood Cemetery Chapel (Cuyahoga Falls, Ohio)
  267. Oakwood Cemetery Mausoleum
  268. Oakwood Estate
  269. Oakwood Historic District (Hickory, North Carolina)
  270. Oakwood Historic District (High Point, North Carolina)
  271. Oakwood–Chimborazo Historic District
  272. Oaky Grove
  273. Oark School-Methodist Church
  274. Oasis Court
  275. Oates Building
  276. Oates House
  277. Oates–Reynolds Memorial Building
  278. Oatlands Historic House & Gardens
  279. Oatman Drug Company Building
  280. Oatman Filling Station
  281. Oats Park Grammar School
  282. Obadiah Smith House
  283. Obediah Barber Homestead
  284. Obediah Farrar House
  285. Obediah Shirley House
  286. Obediah Winston Farm
  287. Oberg-Metcalf House
  288. Oberlin College
  289. Oberlin station
  290. Obidiah Dingee House
  291. Obion County Courthouse
  292. Obion Mounds
  293. Obligation (Harwood, Maryland)
  294. Oblong Friends Meeting House
  295. Observatory Hill Mound Group
  296. Observatory Historic District
  297. Observer Building
  298. Obsidian Cliff
  299. Obsidian Cliff Kiosk
  300. Ocala Historic Commercial District
  301. Ocala Historic District
  302. Ocala Union Station
  303. Occidental Life Building
  304. Occidental Life Insurance Company Building
  305. Occoneechee Speedway
  306. Occoquan Historic District
  307. Occum Hydroelectric Plant and Dam
  308. Ocean City 34th Street Station
  309. Ocean City City Hall
  310. Ocean City Life-Saving Station (New Jersey)
  311. Ocean City Residential Historic District
  312. Ocean City Tenth Street Station
  313. Ocean County Courthouse
  314. Ocean Drive Historic District
  315. Ocean Forest Country Club
  316. Ocean Grove, New Jersey
  317. Ocean Hall
  318. Ocean Park Historic Buildings
  319. Ocean Parkway (Brooklyn)
  320. Ocean Parkway Jewish Center
  321. Ocean Parkway station
  322. Ocean Road Historic District
  323. Ocean Spray Hotel
  324. Ocean Wave (shipwreck)
  325. Ocean to Ocean Bridge
  326. Oceana Neighborhood Historic District
  327. Oceanside City Hall and Fire Station
  328. Ochee Spring Quarry
  329. Ochlocknee Missionary Baptist Church and Cemetery
  330. Ochre Point–Cliffs Historic District
  331. Ocilla Public School
  332. Ocmulgee Mounds National Historical Park
  333. Ocoee Christian Church (Ocoee, Florida)
  334. Ocoee Dam No. 1
  335. Ocoee Dam No. 2
  336. Ocoee Dam No. 3
  337. Ocoee Street Historic District
  338. Oconaluftee (Great Smoky Mountains)
  339. Oconaluftee Baptist Church
  340. Oconee County Cage
  341. Oconee County Courthouse (1956)
  342. Oconee Hill Cemetery
  343. Oconee State Park
  344. Oconee Station State Historic Site
  345. Oconee Street School
  346. Oconomowoc station
  347. Oconto County Courthouse
  348. Ocqueoc Falls Highway–Ocqueoc River Bridge
  349. Ocqueoc Outdoor Center
  350. Ocracoke Historic District
  351. Ocracoke Light
  352. Octagon Barn, Otter Township
  353. Octagon Barn, Richland Township
  354. Octagon Building (Santa Cruz, California)
  355. Octagon Cottage (Rocky Hill, Kentucky)
  356. Octagon Hall
  357. Octagon House (Barrington, Illinois)
  358. Octagon House (Columbus, Georgia)
  359. Octagon House (Danbury, Connecticut)
  360. Octagon House (Fond du Lac, Wisconsin)
  361. Octagon House (Laurens, South Carolina)
  362. Octagon House (Reading, Massachusetts)
  363. Octagon House (Stamford, Connecticut)
  364. Octagon House (Watertown, Wisconsin)
  365. Octagon House (Westfield, Massachusetts)
  366. Octagon Round Barn, Indian Creek Township
  367. Octagon Stone Schoolhouse
  368. Octagonal Poultry House
  369. Octagonal Schoolhouse (Cowgill's Corner, Delaware)
  370. Octagonal Schoolhouse (Essex, New York)
  371. Octonia Stone
  372. Octorara Farm
  373. Odalmelech
  374. Odd Fellows Block (Afton, Iowa)
  375. Odd Fellows Block (Grand Forks, North Dakota)
  376. Odd Fellows Block (Lewiston, Maine)
  377. Odd Fellows Building (Casper, Wyoming)
  378. Odd Fellows Building (Gary, South Dakota)
  379. Odd Fellows Building (Malden, Massachusetts)
  380. Odd Fellows Building (Owensboro, Kentucky)
  381. Odd Fellows Building (Pikeville, Kentucky)
  382. Odd Fellows Building (Portland, Oregon)
  383. Odd Fellows Building (Raleigh, North Carolina)
  384. Odd Fellows Building (Red Bluff, California)
  385. Odd Fellows Building and Auditorium
  386. Odd Fellows Cemetery (Starkville, Mississippi)
  387. Odd Fellows Hall (Alexandria, Virginia)
  388. Odd Fellows Hall (Baltimore, 1891)
  389. Odd Fellows Hall (Beaver, Utah)
  390. Odd Fellows Hall (Big Horn, Wyoming)
  391. Odd Fellows Hall (Blacksburg, Virginia)
  392. Odd Fellows Hall (Cambridge, Massachusetts)
  393. Odd Fellows Hall (Covington, Kentucky)
  394. Odd Fellows Hall (Eureka, California)
  395. Odd Fellows Hall (Gonzales, California)
  396. Odd Fellows Hall (Hilliard, Ohio)
  397. Odd Fellows Hall (La Grange, California)
  398. Odd Fellows Hall (Monticello, Iowa)
  399. Odd Fellows Hall (New York City)
  400. Odd Fellows Hall (Portsmouth, Ohio)
  401. Odd Fellows Hall (Salmon, Idaho)
  402. Odd Fellows Hall (Sandusky, Ohio)
  403. Odd Fellows Hall (Santa Ana, California)
  404. Odd Fellows Hall (Troy Mills, Iowa)
  405. Odd Fellows Home District
  406. Odd Fellows Home of Dell Rapids
  407. Odd Fellows Lodge (Bel Air, Maryland)
  408. Odd Fellows Lodge (Goldsboro, North Carolina)
  409. Odd Fellows Lodge and Temple
  410. Odd Fellows Opera Block
  411. Odd Fellows Rest Cemetery
  412. Odd Fellows Temple (East Liverpool, Ohio)
  413. Odd Fellows Temple (Lexington, Kentucky)
  414. Odd Fellows Temple (Pasadena, California)
  415. Odd Fellows Valley Lodge No. 189 Building
  416. Odd Fellows and Confederate Cemetery
  417. Odd Fellows' Cemetery Mound
  418. Odd Fellows' Hall (Beverly, Massachusetts)
  419. Odd Fellows' Hall (Buckland, Massachusetts)
  420. Odd Fellows' Home (Worcester, Massachusetts)
  421. Odd Fellows' Home for Orphans, Indigent and Aged
  422. Odd Fellows-Rebekah Hall (Cornish, Maine)
  423. Oddfellows Building
  424. Oddfellows Hall (Auburn, California)
  425. Oddfellows Hall (Fairbanks, Alaska)
  426. Oddfellows' Hall (East Providence, Rhode Island)
  427. Odell Building
  428. Odell House
  429. Odell-Locke-Randolph Cotton Mill
  430. Odeon Theater (Tucumcari, New Mexico)
  431. Odessa Historic District
  432. Odessa Ice Cream Company Building
  433. Oeldorf Building
  434. Oella, Maryland
  435. Oesterlein Machine Company-Fashion Frocks, Inc. Complex
  436. Off-the-Neck Historic District
  437. Offerman Building
  438. Office Bridge
  439. Office Hall
  440. Officers Quarters, Washington Navy Yard
  441. Officers Row
  442. Officers' Row Historic District
  443. Offshore Reefs Archeological District
  444. Offutt Covered Bridge
  445. Oficina de Telégrafo y Teléfono
  446. Ogden Apartment Hotel
  447. Ogden High School
  448. Ogden House (Swarthmore, Pennsylvania)
  449. Ogden Theatre
  450. Ogden-Fettie Site
  451. Ogden/Weber Municipal Building
  452. Ogdensburg Armory
  453. Ogdensburg Harbor Light
  454. Ogilvie Building
  455. Ogilvie Moses Farmhouse
  456. Ogilvie Watertower
  457. Ogle County Courthouse
  458. Oglebay Hall
  459. Oglebay Park
  460. Oglesby-Conrad House
  461. Oglethorpe University
  462. Ogontz Hall
  463. Ogunquit Memorial Library
  464. Ogunquit Playhouse
  465. Ogunquit, Maine
  466. Ohave Shalom Synagogue (Woodridge, New York)
  467. Oheka Castle
  468. Ohev Sholem Synagogue (New London, Connecticut)
  469. Ohev Sholom Temple
  470. Oheyawahi-Pilot Knob
  471. Ohio Baptist General Association Headquarters
  472. Ohio Boulevard–Deming Park Historic District
  473. Ohio City, Cleveland
  474. Ohio Company Land Office
  475. Ohio Farm Bureau Federation Offices
  476. Ohio Finance Building
  477. Ohio Governor's Mansion
  478. Ohio History Center
  479. Ohio Judicial Center
  480. Ohio Military Institute
  481. Ohio Moline Plow Building
  482. Ohio National Bank
  483. Ohio National Guard Armory
  484. Ohio Oil Company Building
  485. Ohio Stadium
  486. Ohio State Normal College at Kent
  487. Ohio State Reformatory
  488. Ohio Statehouse
  489. Ohio Street Bridge
  490. Ohio Street Methodist Episcopal Church Complex
  491. Ohio Theatre (Columbus, Ohio)
  492. Ohio Theatre (Lima, Ohio)
  493. Ohio Theatre (Loudonville, Ohio)
  494. Ohio Theatre (Toledo, Ohio)
  495. Ohio University Lancaster historic bridges
  496. Ohio and Erie Canal
  497. Ohkay Owingeh, New Mexico
  498. Ohlman-Shannon House
  499. Ohringer Building
  500. Oil Capital Historic District (Tulsa, Oklahoma)
  501. Oil City Armory
  502. Oil City Downtown Commercial Historic District
  503. Oil City North Side Historic District
  504. Oil City South Side Historic District
  505. Oil Springs Methodist Church
  506. Oil and Gas Building
  507. Ojibway Fire Tower
  508. Ojo Caliente Hot Springs
  509. Ojo Caliente Hot Springs Round Barn
  510. Okahumpka Rosenwald School
  511. Okeechobee Battlefield
  512. Okehocking Historic District
  513. Oklahoma A & M College Agronomy Barn and Seed House
  514. Oklahoma City Discovery Well
  515. Oklahoma City Ford Motor Company Assembly Plant
  516. Oklahoma City National Memorial
  517. Oklahoma City University
  518. Oklahoma County Courthouse
  519. Oklahoma Judicial Center
  520. Oklahoma Natural Gas Company Building
  521. Oklahoma Odd Fellows Home at Checotah
  522. Oklahoma Presbyterian College
  523. Oklahoma Publishing Company Building
  524. Oklahoma State Capitol
  525. Okmulgee Downtown Historic District
  526. Okmulgee Public Library
  527. Okoboji Bridge
  528. Okolona (Middletown, Delaware)
  529. Okolona College
  530. Okolona Colored High School Gymnasium
  531. Ola Babcock Miller Building
  532. Olaf Lee House
  533. Olaf Stordahl Barn
  534. Olallie Lake Guard Station
  535. Olana State Historic Site
  536. Olcovich–Meyers House
  537. Old Administration Building (Bryce Canyon National Park)
  538. Old Administrative Area Historic District
  539. Old Adobe Barn
  540. Old Albany Academy Building
  541. Old Albany Post Road
  542. Old Albany Schoolhouse
  543. Old Albuquerque Municipal Airport Building
  544. Old Alexander House
  545. Old Allamakee County Courthouse (Lansing, Iowa)
  546. Old Allamakee County Courthouse (Waukon, Iowa)
  547. Old Allegany County Courthouse
  548. Old Allegheny Rows Historic District
  549. Old Alpha Tau Omega Fraternity House (Eugene, Oregon)
  550. Old Alton Bridge
  551. Old Anchorage City Hall
  552. Old Appleton Bridge
  553. Old Arkansas City High School
  554. Old Armijo School
  555. Old Armory (Williston, North Dakota)
  556. Old Asbury Methodist Church
  557. Old Ashland Post Office
  558. Old Ashton Historic District
  559. Old Athens, Alabama Main Post Office
  560. Old Athol High School
  561. Old Attleboro Post Office
  562. Old Augusta Historic Site
  563. Old Bacon Academy
  564. Old Baker County Courthouse
  565. Old Baldy (Lynch, Nebraska)
  566. Old Baltimore College of Dental Surgery
  567. Old Bank of America Building (Red Bluff, California)
  568. Old Bank of Amity
  569. Old Bank of Louisville
  570. Old Banks County Courthouse
  571. Old Baptist Parsonage (Scotch Plains, New Jersey)
  572. Old Barn (Canton, Massachusetts)
  573. Old Barnhill Building
  574. Old Barracks Museum
  575. Old Bartow County Courthouse
  576. Old Batesburg Grade School
  577. Old Batesburg-Leesville High School
  578. Old Battle Creek Post Office
  579. Old Bayfield County Courthouse
  580. Old Bayview Cemetery
  581. Old Bedford County Jail
  582. Old Beechwold Historic District
  583. Old Bell Telephone Building (Osceola, Arkansas)
  584. Old Belleair Town Hall
  585. Old Belvidere High School (Belvidere, Illinois)
  586. Old Bend High School
  587. Old Bennington High School
  588. Old Bennington Post Office
  589. Old Bennington, Vermont
  590. Old Benton-Sardis Road Bridge
  591. Old Bergen Church
  592. Old Berkeley City Hall
  593. Old Berkeley County Courthouse (South Carolina)
  594. Old Berlin High School
  595. Old Berrien County Courthouse Complex
  596. Old Berrien County Jail
  597. Old Beta Theta Pi Fraternity House
  598. Old Beth Israel Synagogue (Greenville, South Carolina)
  599. Old Bethany Church
  600. Old Bethel Methodist Church (Arkansas)
  601. Old Bethel United Methodist Church
  602. Old Billerica Road Historic District
  603. Old Bittermann Building
  604. Old Blenheim Bridge
  605. Old Bloomfield
  606. Old Bloomington High School
  607. Old Bluff Presbyterian Church
  608. Old Bnai Zion Synagogue
  609. Old Boardman Bridge
  610. Old Borges Ranch
  611. Old Bourne High School building
  612. Old Bradford County Courthouse
  613. Old Brewer High School
  614. Old Brick Church (Athens, Vermont)
  615. Old Brick Church (Bacon's Castle, Virginia)
  616. Old Brick Church (Fairfield County, South Carolina)
  617. Old Brick Church (Iowa City, Iowa)
  618. Old Brick House
  619. Old Brick House (Biloxi, Mississippi)
  620. Old Brick Post Office (Wickenburg, Arizona)
  621. Old Brick Presbyterian Church
  622. Old Brick Store
  623. Old Bridge (unincorporated community), New Jersey
  624. Old Bridgeville Fire House
  625. Old Bristol High School
  626. Old Broad Street Presbyterian Church and Cemetery
  627. Old Broadway Synagogue
  628. Old Brooklyn Fire Headquarters
  629. Old Brown's Mill School
  630. Old Brulay Plantation
  631. Old Brunswick County Courthouse (North Carolina)
  632. Old Bunnell State Bank Building
  633. Old Burying Ground (Beaufort, North Carolina)
  634. Old Burying Ground (Littleton, Massachusetts)
  635. Old Burying Ground (Stoneham, Massachusetts)
  636. Old Burying Ground (Watertown, Massachusetts)
  637. Old Cadillac City Hall
  638. Old Cahokia Courthouse
  639. Old Calaboose
  640. Old Calhoun County Courthouse
  641. Old California City Hall and Fire Station
  642. Old Cambridge Baptist Church
  643. Old Cambridge Historic District
  644. Old Cambridgeport Historic District
  645. Old Camden Post Office
  646. Old Camp Verde
  647. Old Campus District, University of South Carolina
  648. Old Campus Historic District (St. Lawrence University)
  649. Old Cann Mansion House
  650. Old Cape May County Courthouse Building
  651. Old Capitol Building
  652. Old Castle (Rockport, Massachusetts)
  653. Old Castle Hall
  654. Old Catonsville High School
  655. Old Catonsville Historic District
  656. Old Cawker City Library
  657. Old Cedar Baptist Church
  658. Old Center Burying Yard
  659. Old Central
  660. Old Central Fire Station (North Little Rock, Arkansas)
  661. Old Central Fire Station (Pittsfield, Massachusetts)
  662. Old Central Grammar School
  663. Old Central High School (Kalamazoo, Michigan)
  664. Old Central High School (Pittsfield, Massachusetts)
  665. Old Centre Historic District
  666. Old Challis Historic District
  667. Old Chapel (Amherst, Massachusetts)
  668. Old Chapel (Millwood, Virginia)
  669. Old Chapel Church
  670. Old Chapel Hall
  671. Old Chapel Hill Cemetery
  672. Old Chappaqua Historic District
  673. Old Charles Town Historic District
  674. Old Chattahoochee County Courthouse
  675. Old Cheboygan County Courthouse
  676. Old Chelmsford Garrison House
  677. Old Chestnut Hill Historic District
  678. Old Chicago Main Post Office
  679. Old Chief Joseph Gravesite
  680. Old China Trail
  681. Old Chiswell Place
  682. Old Christ Church (Bethel, Vermont)
  683. Old Christ Church (Laurel, Delaware)
  684. Old Christ Church (Pensacola, Florida)
  685. Old Christiansburg Industrial Institute
  686. Old Churchyard Cemetery
  687. Old Citrus County Courthouse
  688. Old City Cemetery (Columbus, Georgia)
  689. Old City Cemetery (Lynchburg, Virginia)
  690. Old City Hall (Boston)
  691. Old City Hall (Davenport, Iowa)
  692. Old City Hall (Fairbanks, Alaska)
  693. Old City Hall (Gilroy, California)
  694. Old City Hall (Knoxville)
  695. Old City Hall (Lancaster, Pennsylvania)
  696. Old City Hall (Mobile, Alabama)
  697. Old City Hall (Richmond, Virginia)
  698. Old City Hall (St. Charles, Missouri)
  699. Old City Hall (Tacoma, Washington)
  700. Old City Hall (Williamsport, Pennsylvania)
  701. Old City Hall Historic District
  702. Old City Hall and Engine House
  703. Old City Road Stone Arch Bridge
  704. Old City Waterworks
  705. Old City, Philadelphia
  706. Old Clarke County Courthouse (Virginia)
  707. Old Clarksville site
  708. Old Classroom Building, Union College
  709. Old Clay County Courthouse (West Virginia)
  710. Old Clifty Church
  711. Old Clinch County Jail
  712. Old Clinton Historic District
  713. Old Clock at Zion's First National Bank
  714. Old Clovis Post Office
  715. Old Cochecton Cemetery
  716. Old Cochrane Road Bridge
  717. Old College Hill Post Office
  718. Old College Historic District
  719. Old Colleton County Jail
  720. Old Collier County Courthouse
  721. Old Colony Cove Site
  722. Old Colony House
  723. Old Colony Iron Works-Nemasket Mills Complex
  724. Old Colorado City
  725. Old Conemaugh Borough Historic District
  726. Old Congregational Church (North Scituate, Rhode Island)
  727. Old Constitution House
  728. Old Cony High School
  729. Old Corinth Cemetery
  730. Old Corner Bookstore
  731. Old Cortez High School
  732. Old County Courthouse
  733. Old County Road South Historic District
  734. Old Courthouse (Buena Vista, Virginia)
  735. Old Courthouse Square (Lake Providence, Louisiana)
  736. Old Covered Bridge
  737. Old Crawfordsville High School
  738. Old Croton Dam
  739. Old Curtisville Historic District
  740. Old Custom House (Cairo, Illinois)
  741. Old Custom House (Monterey, California)
  742. Old Custom House (Yorktown, Virginia)
  743. Old Customs House (Knoxville, Tennessee)
  744. Old Customshouse (Erie, Pennsylvania)
  745. Old Customshouse (Wilmington, Delaware)
  746. Old Danish Church
  747. Old Dauphin Way Historic District
  748. Old Davidson County Courthouse (North Carolina)
  749. Old DeLand Memorial Hospital
  750. Old Deerfield Center Historic District
  751. Old Deerfield School
  752. Old Deery Inn
  753. Old Delta Democrat Times Building
  754. Old Denton
  755. Old Depot Museum
  756. Old Dillard High School
  757. Old District 10 Schoolhouse
  758. Old Donation Episcopal Church
  759. Old Douglas Center Historic District
  760. Old Dowlin Mill
  761. Old Downtown Des Moines Library
  762. Old Downtown Harrisburg Commercial Historic District
  763. Old Drawyers Church
  764. Old Dry Road
  765. Old DuPage County Courthouse
  766. Old Durand High School
  767. Old Dutch Church (Kingston, New York)
  768. Old Dutch Church Parsonage
  769. Old Dutch Church of Sleepy Hollow
  770. Old Dutch Parsonage
  771. Old Eagle Tavern
  772. Old East
  773. Old East Baltimore Historic District
  774. Old East Boston High School
  775. Old East Haven High School
  776. Old East Historic District
  777. Old East Paint Creek Lutheran Church
  778. Old Ebenezer Church
  779. Old Economy Village
  780. Old Eddyville Historic District
  781. Old Effingham County Courthouse
  782. Old Elm Spring Colony, South Dakota
  783. Old Engine Company 26 (Washington, D.C.)
  784. Old Engine Company No. 6
  785. Old Enon Road Stone Arch Culvert
  786. Old Episcopal Manse
  787. Old Essex County Jail
  788. Old Executive Mansion
  789. Old Faithful Historic District
  790. Old Faithful Inn
  791. Old Farm
  792. Old Farm Schoolhouse
  793. Old Fauquier County Jail
  794. Old Federal Building (Anchorage)
  795. Old Federal Building (Fairbanks, Alaska)
  796. Old Federal Building (Sault Ste. Marie)
  797. Old Federal Reserve Bank Building (Philadelphia)
  798. Old Federal Reserve Bank Building (San Francisco)
  799. Old Fellwock Auto Company
  800. Old Fernald-Laughton Memorial Hospital
  801. Old Finnish Lutheran Church
  802. Old Fire Engine House
  803. Old Fire House
  804. Old Fire House No. 4 (Kalamazoo, Michigan)
  805. Old Fire Station (Chester, Illinois)
  806. Old First Church (Huntington, New York)
  807. Old First Methodist Episcopal Church South
  808. Old First National Bank of Prineville
  809. Old First National Bank of Punta Gorda
  810. Old First Presbyterian Church (Kosciusko, Mississippi)
  811. Old First Presbyterian Church (Newark, Delaware)
  812. Old First Presbyterian Church (Newark, New Jersey)
  813. Old First Presbyterian Church (Wilmington, Delaware)
  814. Old First Reformed Church (Brooklyn)
  815. Old Florence Water Tower
  816. Old Ford Dairy
  817. Old Forge Farm
  818. Old Forge Farm (Middletown, Virginia)
  819. Old Fort (Miami, Missouri)
  820. Old Fort Bliss
  821. Old Fort Braden School
  822. Old Fort Church
  823. Old Fort Commercial Historic District
  824. Old Fort Harrod State Park
  825. Old Fort House (Columbus, Mississippi)
  826. Old Fort House (Fort Edward, New York)
  827. Old Fort Johnson
  828. Old Fort Madison High School
  829. Old Fort Park Archeological Site
  830. Old Fort Park and Golf Course
  831. Old Fort Pierce City Hall
  832. Old Fort Pierce Park
  833. Old Fort Pierce Post Office
  834. Old Fourth Ward Historic District
  835. Old Fourth Ward Southeast Historic District
  836. Old Frankfort Stone High School
  837. Old Franklin United Brethren Church
  838. Old Fremont Post Office
  839. Old Fresno Water Tower
  840. Old Friends Archeological Site
  841. Old Friendship United Methodist Church
  842. Old Frio County Jail
  843. Old Frostproof High School
  844. Old Gaissert Homeplace
  845. Old Garfield School (Salem, Oregon)
  846. Old Garrard County Jail
  847. Old Garrison House
  848. Old Georgetown City Hall
  849. Old Georgetown Road (Charleston County, South Carolina)
  850. Old Gerald School
  851. Old German Baptist Brethren Church (Winston-Salem)
  852. Old Germantown Academy and Headmasters' Houses
  853. Old Gillett Jail
  854. Old Glen Cove Post Office
  855. Old Gothic Barns
  856. Old Goucher College Buildings
  857. Old Government House (Augusta, Georgia)
  858. Old Governor's Mansion (Frankfort, Kentucky)
  859. Old Governor's Mansion (Milledgeville, Georgia)
  860. Old Grace Episcopal Church Rectory
  861. Old Grafton County Courthouse
  862. Old Grand Rapids Christian High School
  863. Old Grandin Library
  864. Old Gravesend Cemetery
  865. Old Gray Cemetery
  866. Old Gray County Courthouse
  867. Old Gray House
  868. Old Grayson County Courthouse and Clerk's Office
  869. Old Greencastle Historic District
  870. Old Greene County Courthouse
  871. Old Greenville (23WE637)
  872. Old Greenwich station
  873. Old Greenwood Cemetery
  874. Old Greenwood High School
  875. Old Grist Mill
  876. Old Guaranty Bank Building
  877. Old Gym (Vanderbilt University)
  878. Old Haines City National Guard Armory
  879. Old Hall County Courthouse (Georgia)
  880. Old Hamilton County Jail
  881. Old Hamilton Library
  882. Old Hampden Academy Building
  883. Old Hancock Central High School
  884. Old Hancock County Buildings
  885. Old Hanover High School
  886. Old Hansen Planetarium
  887. Old Harbor Historic District
  888. Old Harbor Reservation Parkways
  889. Old Harbor U.S. Life Saving Station
  890. Old Hardy County Courthouse
  891. Old Harrison County Courthouse (Iowa)
  892. Old Harrison County Courthouse (Texas)
  893. Old Hartwick Village Cemetery
  894. Old Hattiesburg High School
  895. Old Hawleyton Methodist Episcopal Church
  896. Old Headquarters Area Historic District
  897. Old Heidelberg Apartments
  898. Old Hemlock
  899. Old Hendry County Courthouse
  900. Old Hernando Elementary School
  901. Old Hickman Historic District
  902. Old Hickory United Methodist Church
  903. Old Higgins Farm Windmill
  904. Old High Middle School (Bentonville, Arkansas)
  905. Old Highway 16 Bridge
  906. Old Hill Place Bridge
  907. Old Holy Redeemer Catholic Church
  908. Old Homer Village Historic District
  909. Old Homestead (Aberdeen, Mississippi)
  910. Old Homestead (Enon Valley, Pennsylvania)
  911. Old Hoopes School
  912. Old Horry County Courthouse
  913. Old Hose House
  914. Old Hotel (Dumfries, Virginia)
  915. Old House (Cutchogue)
  916. Old House Plantation
  917. Old Huntington High School
  918. Old Huntington Jail
  919. Old Idaho State Penitentiary
  920. Old Indian Cemetery
  921. Old Indian Meeting House
  922. Old Indian River County Courthouse
  923. Old Indiana County Courthouse
  924. Old Indiana County Jail and Sheriff's Office
  925. Old Indianapolis City Hall
  926. Old Irion County Courthouse
  927. Old Iron County Courthouse
  928. Old Irontown, Utah
  929. Old Iroquois County Courthouse
  930. Old Isle of Wight Courthouse
  931. Old Jacoby Creek School
  932. Old Jail (Barnstable, Massachusetts)
  933. Old Jail (Gordo, Alabama)
  934. Old Jail (Muscatine, Iowa)
  935. Old Jail (Washington, Georgia)
  936. Old Jefferson Parish Courthouse
  937. Old Jeffersonville Historic District
  938. Old Joe (Norfork, Arkansas)
  939. Old Judy Church
  940. Old Kennebunk High School
  941. Old Kennett Meetinghouse
  942. Old Kentuck
  943. Old Kentucky Turnpike Historic District
  944. Old Killingly High School
  945. Old King's Highway Historic District
  946. Old Kingsport Presbyterian Church
  947. Old LSU Site
  948. Old La Grange Schoolhouse
  949. Old Ladore School
  950. Old Lafayette City Hall
  951. Old Lake County Courthouse (California)
  952. Old Lake County Courthouse (Florida)
  953. Old Lake Worth City Hall
  954. Old Lakeland High School
  955. Old Las Vegas Mormon Fort State Historic Park
  956. Old Laurel High School
  957. Old Lee County Courthouse
  958. Old Lehigh County Courthouse
  959. Old Lenox High School building
  960. Old Library (Bryn Mawr College)
  961. Old Library Building (Chattanooga, Tennessee)
  962. Old Library Building (Maysville, Kentucky)
  963. Old Linn County Jail
  964. Old Little Rock Central Fire Station
  965. Old Live Oak City Hall
  966. Old Livery Stable
  967. Old Livingston Parish Courthouse
  968. Old Lock Pump House, Chesapeake & Delaware Canal
  969. Old Log Church
  970. Old Logan County Courthouse (Kansas)
  971. Old Logan County Jail
  972. Old Lone Star Brewery
  973. Old Lordsburg High School
  974. Old Lorimier Cemetery
  975. Old Louisiana Governor's Mansion
  976. Old Louisiana State Capitol
  977. Old Louisville
  978. Old Lucerne Historic Residential District
  979. Old Lutheran Parsonage
  980. Old Lutz Elementary School
  981. Old Lyford High School
  982. Old Lyme Historic District
  983. Old Lynn High School
  984. Old M-94–Au Train River Bridge
  985. Old M-95–Michigamme River Bridge
  986. Old Mackinac Point Light
  987. Old Madison County Courthouse
  988. Old Maid's Orchard Mound
  989. Old Main (Arizona State University)
  990. Old Main (Augsburg University)
  991. Old Main (Bethany College)
  992. Old Main (California University of Pennsylvania)
  993. Old Main (Dakota College at Bottineau)
  994. Old Main (Eastern Illinois University)
  995. Old Main (Franklin College)
  996. Old Main (Iowa Wesleyan University)
  997. Old Main (Marshall University)
  998. Old Main (Minnesota State University, Mankato)
  999. Old Main (Nicholas County High School)
  1000. Old Main (North Park University)
  1001. Old Main (Texas State University)
  1002. Old Main (University of Arkansas)
  1003. Old Main (University of North Carolina at Pembroke)
  1004. Old Main (University of South Dakota)
  1005. Old Main (University of Wyoming)
  1006. Old Main (Utah State University)
  1007. Old Main (Wartburg College)
  1008. Old Main Street Historic District (Dubuque, Iowa)
  1009. Old Main Street Historic District (Racine, Wisconsin)
  1010. Old Main and Chemistry Building
  1011. Old Main at the Lutheran Home at Topton
  1012. Old Main, Augustana College
  1013. Old Main, Goethean Hall, and Diagnothian Hall
  1014. Old Main, Knox College
  1015. Old Main, Nebraska Wesleyan University
  1016. Old Main, Suomi College
  1017. Old Main, University of Arizona
  1018. Old Man House
  1019. Old Manatee County Courthouse
  1020. Old Mandan High School
  1021. Old Mansion
  1022. Old Marengo County Courthouse
  1023. Old Marion County Courthouse (Georgia)
  1024. Old Market (Louisville, Georgia)
  1025. Old Market (Omaha, Nebraska)
  1026. Old Market Building (Georgetown, South Carolina)
  1027. Old Market House (Galena, Illinois)
  1028. Old Martin County Courthouse
  1029. Old Masonic Hall (Bellville, Texas)
  1030. Old Masonic Hall (Benicia, California)
  1031. Old Masonic Hall (Louisville, Mississippi)
  1032. Old Masonic Temple (Marshall, Minnesota)
  1033. Old Mauch Chunk Historic District
  1034. Old McCulloch County Jail
  1035. Old McDonald County Courthouse
  1036. Old McHenry County Courthouse
  1037. Old McKenzie Fish Hatchery
  1038. Old McKinley High School
  1039. Old Medford High School
  1040. Old Medical College
  1041. Old Meigs County Courthouse
  1042. Old Merchants and Farmers Bank Building
  1043. Old Methodist District Parsonage
  1044. Old Michigan Avenue School
  1045. Old Michigan City Light
  1046. Old Middletown High School
  1047. Old Middletown Post Office
  1048. Old Midtown Historic District (Harrisburg)
  1049. Old Military Road
  1050. Old Mill (West Tisbury, Massachusetts)
  1051. Old Mill House
  1052. Old Mill Road Bridge
  1053. Old Mill Site Historic District
  1054. Old Mill State Park
  1055. Old Mill at Tinton Falls
  1056. Old Miller Hospital
  1057. Old Mine Park Archeological Site
  1058. Old Mine Road Historic District
  1059. Old Minnehaha County Courthouse
  1060. Old Mishawaka Carnegie Library
  1061. Old Mission Dam
  1062. Old Mission House
  1063. Old Mission Inn
  1064. Old Mission State Park
  1065. Old Mississippi State Capitol
  1066. Old Mobile Site
  1067. Old Monroe County Courthouse
  1068. Old Monroe School House
  1069. Old Morris County Courthouse
  1070. Old Morrison Mill
  1071. Old Mt. Carmel Cemetery, Wrought-Iron Cross Site
  1072. Old Muhlenberg County Jail
  1073. Old Mulkey Meetinghouse
  1074. Old Napa Register Building
  1075. Old Narragansett Cemetery
  1076. Old Narragansett Church
  1077. Old Nassau County Courthouse (New York)
  1078. Old Natchez Trace segments listed on the National Register of Historic Places
  1079. Old National Park Service Housing Historic District
  1080. Old National Pike Milestones
  1081. Old Naval Hospital
  1082. Old Naval Observatory
  1083. Old Nazareth Academy
  1084. Old Nebraska State Bank Building
  1085. Old Neck Historic District
  1086. Old Neighborhoods Historic District
  1087. Old New England Building
  1088. Old New York Evening Post Building
  1089. Old New-Gate Prison
  1090. Old Newark Comprehensive School
  1091. Old Newberry County Courthouse
  1092. Old Newburgh Presbyterian Church
  1093. Old Nicolet High School
  1094. Old Nogales City Hall and Fire Station
  1095. Old Norfolk City Hall
  1096. Old Norriton Presbyterian Church
  1097. Old North Carolina Mutual Life Insurance Company Building
  1098. Old North Cemetery (Concord, New Hampshire)
  1099. Old North Cemetery (Hartford, Connecticut)
  1100. Old North Cemetery (Portsmouth, New Hampshire)
  1101. Old North Cemetery (Truro, Massachusetts)
  1102. Old North Church
  1103. Old North End Historic District (Colorado Springs, Colorado)
  1104. Old North End Historic District (Columbus, Ohio)
  1105. Old North Knoxville
  1106. Old North Tower, University of Central Oklahoma
  1107. Old Northside Historic District
  1108. Old Northwood Historic District
  1109. Old Nueces County Courthouse
  1110. Old Oak
  1111. Old Ohavi Zedek Synagogue
  1112. Old Orange County Courthouse (California)
  1113. Old Orange County Courthouse (North Carolina)
  1114. Old Orchard Beach Inn
  1115. Old Orchard Shoal Light
  1116. Old Oxford Mill
  1117. Old Ozaukee County Courthouse
  1118. Old Palm Beach Junior College Building
  1119. Old Palmetto Hotel
  1120. Old Parsonage
  1121. Old Pasadena
  1122. Old Pascagoula High School
  1123. Old People's Home (Omaha)
  1124. Old People's Home (Tampa, Florida)
  1125. Old Perry County Courthouse (Rome, Indiana)
  1126. Old Perry Post Office
  1127. Old Petaluma Opera House
  1128. Old Philadelphia Presbyterian Church
  1129. Old Pickens Jail
  1130. Old Pickens Presbyterian Church
  1131. Old Piedras River Aqueduct
  1132. Old Pike Inn
  1133. Old Pilgrim Baptist Church Cemetery and Kilgore Family Cemetery
  1134. Old Pine Church
  1135. Old Pine Street Station
  1136. Old Pinecrest Hotel
  1137. Old Pinellas County Courthouse
  1138. Old Piqua High School
  1139. Old Plat Historic District
  1140. Old Platte Clove Post Office
  1141. Old Plover Methodist Church
  1142. Old Point Comfort Light
  1143. Old Point Loma Lighthouse
  1144. Old Police Headquarters
  1145. Old Polk County Courthouse (Florida)
  1146. Old Port Columbus Terminal
  1147. Old Port of Portland, Maine
  1148. Old Portlock School No. 5
  1149. Old Post Office (Albany, New York)
  1150. Old Post Office (Albuquerque, New Mexico)
  1151. Old Post Office (Augusta, Maine)
  1152. Old Post Office (Biddeford, Maine)
  1153. Old Post Office (Buffalo, New York)
  1154. Old Post Office (Hot Springs, Arkansas)
  1155. Old Post Office (Iowa City, Iowa)
  1156. Old Post Office (Kirkwood, Delaware)
  1157. Old Post Office (Liberty, Maine)
  1158. Old Post Office (Oneonta, New York)
  1159. Old Post Office (Pullman, Washington)
  1160. Old Post Office (Rogers, Arkansas)
  1161. Old Post Office (Washington, D.C.)
  1162. Old Post Office (Watertown, South Dakota)
  1163. Old Post Office Block
  1164. Old Post Office Building (Brockton, Massachusetts)
  1165. Old Post Office Building (Lynn, Massachusetts)
  1166. Old Post Office Building and Customhouse (Little Rock, Arkansas)
  1167. Old Post Office and Courthouse (Auburn, New York)
  1168. Old Post Office and Customshouse (Key West, Florida)
  1169. Old Pottstown Historic District
  1170. Old Poughkeepsie YMCA
  1171. Old Presbyterian Church (Barnwell, South Carolina)
  1172. Old Presbyterian Church (Parker, Arizona)
  1173. Old Presbyterian Meeting House
  1174. Old Presque Isle Light
  1175. Old Prince Edward County Clerk's Office
  1176. Old Probst Church
  1177. Old Providence Church
  1178. Old Providence Presbyterian Church
  1179. Old Providence Stone Church
  1180. Old Public Library
  1181. Old Quaker Meeting House (Queens)
  1182. Old Queens
  1183. Old Randolph County Courthouse (Arkansas)
  1184. Old Rectory (Perrowville, Virginia)
  1185. Old Red Mill
  1186. Old Red Mill and Mill House
  1187. Old Redfield City Hall
  1188. Old Redwater Bridge
  1189. Old Richmond Historic District
  1190. Old Richmond Schoolhouse and Gymnasium
  1191. Old River Bridge
  1192. Old Riverton Inn
  1193. Old Roanoke County Courthouse
  1194. Old Rock House (Harpersville, Alabama)
  1195. Old Rock House (Moscow Mills, Missouri)
  1196. Old Rock House (Thomson, Georgia)
  1197. Old Rock School (Dodgeville, Wisconsin)
  1198. Old Rock School (Guntersville, Alabama)
  1199. Old Rock School (Prairie du Chien, Wisconsin)
  1200. Old Rockport High School
  1201. Old Rockport Hutterite Colony
  1202. Old Rockville High School and East School
  1203. Old Rondo Cemetery
  1204. Old Rose Tree Tavern
  1205. Old Rotation
  1206. Old Roycemore School building
  1207. Old Runnymede Church
  1208. Old Russell County Courthouse
  1209. Old Ryan Farm
  1210. Old Saco High School
  1211. Old Sacramento State Historic Park
  1212. Old Saint Hilary's Church
  1213. Old Saint John Nepomocene Cemetery, Wrought-Iron Cross Site
  1214. Old Saint Paul's Cemetery
  1215. Old Saints Peter and Paul Cemetery, Wrought-Iron Cross Site
  1216. Old Salem
  1217. Old Salem Church and Cemetery
  1218. Old San Antonio City Cemeteries Historic District
  1219. Old San Antonio Hospital
  1220. Old San Francisco Mint
  1221. Old San Juan
  1222. Old Santa Rosa Catholic Church and Cemetery
  1223. Old Santa Susana Stage Road
  1224. Old Saratoga Reformed Church
  1225. Old Sardinia Town Hall
  1226. Old Savonoski Site
  1227. Old Saybrook South Green
  1228. Old Scarborough High School
  1229. Old School Baptist Church and Cemetery
  1230. Old School Baptist Church of Halcottsville
  1231. Old School House (Tampa, Florida)
  1232. Old School Privy
  1233. Old School Square
  1234. Old Schoolhouse (York, Maine)
  1235. Old Schoolhouse Bridge
  1236. Old Schwamb Mill
  1237. Old Scituate Light
  1238. Old Scotch Church
  1239. Old Scots Burying Ground
  1240. Old Scott County Jail
  1241. Old Scottish Rite Hospital building
  1242. Old Scripps Building
  1243. Old Searcy County Jail
  1244. Old Sebastian County Jail
  1245. Old Second National Bank
  1246. Old Seminary Building
  1247. Old Settler's Irrigation Ditch
  1248. Old Settler's Pavilion
  1249. Old Settlers' Association Park and Rhodham Bonnifield House
  1250. Old Settlers' Association of Johnson County Cabins
  1251. Old Settlers' Burying Ground
  1252. Old Shandon Historic District
  1253. Old Shelby County Courthouse
  1254. Old Sheldon Church Ruins
  1255. Old Shephard Farm
  1256. Old Ship African Methodist Episcopal Zion Church
  1257. Old Ship Church
  1258. Old Ship Street Historic District
  1259. Old Shipbuilder's Historic District
  1260. Old Silk Stocking Neighborhood
  1261. Old Sinclair Station
  1262. Old Sitka Site
  1263. Old Slave Mart
  1264. Old Sloatsburg Cemetery
  1265. Old Somersworth High School
  1266. Old Sopchoppy High School Gymnasium
  1267. Old South Church
  1268. Old South Church (Kirtland, Ohio)
  1269. Old South Mebane Historic District
  1270. Old South Meeting House
  1271. Old South Union Church
  1272. Old Southeast Church (Brewster, New York)
  1273. Old Southeast Town Hall
  1274. Old Southport High School
  1275. Old Spanish Fort (Pascagoula, Mississippi)
  1276. Old Spanish Trail (trade route)
  1277. Old Spink Colony
  1278. Old Spring Tavern
  1279. Old Springdale High School
  1280. Old St. Anastasia Catholic School
  1281. Old St. Andrew's Episcopal Church
  1282. Old St. Andrew's Parish Church
  1283. Old St. Anthony's Catholic Church (Violet, Texas)
  1284. Old St. Ferdinand Shrine
  1285. Old St. Gabriel's Episcopal Church
  1286. Old St. Helena Parish Jail
  1287. Old St. Johns County Jail
  1288. Old St. Joseph Hospital
  1289. Old St. Joseph's Catholic Church
  1290. Old St. Luke's Episcopal Church (Belton, Texas)
  1291. Old St. Luke's Hospital
  1292. Old St. Mary's Catholic Parish House
  1293. Old St. Mary's Cemetery, Wrought-Iron Cross Site
  1294. Old St. Mary's Church (Cincinnati, Ohio)
  1295. Old St. Mary's Church (Milwaukee, Wisconsin)
  1296. Old St. Mary's Church (Tempe, Arizona)
  1297. Old St. Nicholas Russian Orthodox Church
  1298. Old St. Patrick's Church (Chicago)
  1299. Old St. Patrick's Church (Gravois Mills, Missouri)
  1300. Old St. Paul's Methodist Episcopal Church
  1301. Old St. Peter's Church (Van Cortlandtville, New York)
  1302. Old St. Peter's Landmark
  1303. Old St. Raymond's Church
  1304. Old St. Teresa Catholic Church
  1305. Old St. Wenceslaus Catholic Parish House
  1306. Old Stagecoach Stop
  1307. Old State Bank (Decatur, Alabama)
  1308. Old State Bank (Vincennes, Indiana)
  1309. Old State Capitol (Kentucky)
  1310. Old State Capitol (Milledgeville, Georgia)
  1311. Old State Capitol State Historic Site
  1312. Old State House (Boston)
  1313. Old State House (Connecticut)
  1314. Old State House (Dover, Delaware)
  1315. Old State House (Little Rock, Arkansas)
  1316. Old State House (Providence, Rhode Island)
  1317. Old State Mutual Building
  1318. Old State Quarry State Preserve
  1319. Old State Road Bridge
  1320. Old Statehouse Historic District (Frankfort, Kentucky)
  1321. Old Stone Arch (Marshall, Illinois)
  1322. Old Stone Arch Bridge (Bound Brook, New Jersey)
  1323. Old Stone Arch Bridge (Clark Center, Illinois)
  1324. Old Stone Arch Bridge (Lewistown, Pennsylvania)
  1325. Old Stone Barracks
  1326. Old Stone Blacksmith Shop
  1327. Old Stone Church (Buffalo, North Dakota)
  1328. Old Stone Church (Chesterfield, Missouri)
  1329. Old Stone Church (Cleveland, Ohio)
  1330. Old Stone Church (Kingwood Township, New Jersey)
  1331. Old Stone Church (Lewisburg, West Virginia)
  1332. Old Stone Church (West Boylston, Massachusetts)
  1333. Old Stone Church (White Hall, Virginia)
  1334. Old Stone Church (Winchester, Virginia)
  1335. Old Stone Church Archeological Site
  1336. Old Stone Church and Cemetery
  1337. Old Stone Congregational Church
  1338. Old Stone Fort (Schoharie, New York)
  1339. Old Stone Fort (Tennessee)
  1340. Old Stone Hotel
  1341. Old Stone House (Brooklyn)
  1342. Old Stone House (Millboro Springs, Virginia)
  1343. Old Stone House (Morgantown, West Virginia)
  1344. Old Stone House (Pennsboro, West Virginia)
  1345. Old Stone House (Vale, Oregon)
  1346. Old Stone House (Washington, D.C.)
  1347. Old Stone House (Winnsboro, South Carolina)
  1348. Old Stone House (Winooski, Vermont)
  1349. Old Stone House Library
  1350. Old Stone Row
  1351. Old Stone Shop
  1352. Old Stone Tavern (Atkins, Virginia)
  1353. Old Stone Tavern (Frankfort, Kentucky)
  1354. Old Stone Tavern (Little Creek, Delaware)
  1355. Old Stone Tavern (Moorefield, West Virginia)
  1356. Old Stone Warehouse (Rochester, New York)
  1357. Old Stone Wharf Archeological Site
  1358. Old Storm Lake High School
  1359. Old Strother Place
  1360. Old Sugar Mill of Koloa
  1361. Old Sullivan County Courthouse
  1362. Old Sussex County Courthouse
  1363. Old Sutton High School
  1364. Old Talbott Tavern
  1365. Old Tampa Children's Home
  1366. Old Tarpon Springs City Hall
  1367. Old Tarpon Springs High School
  1368. Old Tavern (Burlington, Maine)
  1369. Old Tavern (Sacramento, California)
  1370. Old Tavern Farm
  1371. Old Taylor County Jail
  1372. Old Thames Shipyard
  1373. Old Third District Courthouse
  1374. Old Thomas James Store
  1375. Old Timbers
  1376. Old Todd County Courthouse
  1377. Old Tombstone
  1378. Old Town (Franklin, Tennessee)
  1379. Old Town Bridge (Franklin, Tennessee)
  1380. Old Town Bridge (Wayland, Massachusetts)
  1381. Old Town Cemetery (Newburgh, New York)
  1382. Old Town Center Historic District
  1383. Old Town College Park
  1384. Old Town Eureka
  1385. Old Town Farm
  1386. Old Town Fort Collins
  1387. Old Town Friends' Meetinghouse
  1388. Old Town Green Historic District
  1389. Old Town Hall (Athol, Massachusetts)
  1390. Old Town Hall (Chester, Connecticut)
  1391. Old Town Hall (Pittsfield, Massachusetts)
  1392. Old Town Hall (Stamford, Connecticut)
  1393. Old Town Hall (Tyngsborough, Massachusetts)
  1394. Old Town Hall (Wilmington, Delaware)
  1395. Old Town Hall Historic District (Duxbury, Massachusetts)
  1396. Old Town Hall Historic District (Huntington, New York)
  1397. Old Town Hall and School
  1398. Old Town Historic District (Ames, Iowa)
  1399. Old Town Historic District (Clearfield, Pennsylvania)
  1400. Old Town Historic District (Harrisonburg, Virginia)
  1401. Old Town Historic District (Hartford, Kentucky)
  1402. Old Town Historic District (Huntsville, Alabama)
  1403. Old Town Historic District (North Attleborough, Massachusetts)
  1404. Old Town Historic District (Selma, Alabama)
  1405. Old Town House (Marblehead, Massachusetts)
  1406. Old Town House (Parsonsfield, Maine)
  1407. Old Town House (Union, Maine)
  1408. Old Town Main Post Office
  1409. Old Town Manassas
  1410. Old Town Plantation
  1411. Old Town Residential Historic District (Las Vegas, New Mexico)
  1412. Old Town San Diego State Historic Park
  1413. Old Town Savings Bank
  1414. Old Town Sebastian Historic District, East
  1415. Old Town Sebastian Historic District, West
  1416. Old Town of Flushing Burial Ground
  1417. Old Town, Chicago
  1418. Old Town, Lansing, Michigan
  1419. Old Towne, Orange Historic District
  1420. Old Trail School (Wiggins, Colorado)
  1421. Old Trails Bridge
  1422. Old Trees
  1423. Old Turner Place
  1424. Old Turrell City Hall
  1425. Old U.S. Forest Products Laboratory
  1426. Old U.S. Post Office (Bend, Oregon)
  1427. Old U.S. Post Office (Marion, Ohio)
  1428. Old U.S. Post Office (Niles, Michigan)
  1429. Old U.S. Post Office (Ripley, Mississippi)
  1430. Old U.S. Post Office (Williston, North Dakota)
  1431. Old U.S. Route 79 (Kingsland, Arkansas)
  1432. Old US 41–Backwater Creek Bridge
  1433. Old US 67 Rest Area
  1434. Old Union Church and Cemetery
  1435. Old Union County Courthouse (Georgia)
  1436. Old Union County Courthouse (Pennsylvania)
  1437. Old Union County Jail (Blairsville, Georgia)
  1438. Old Union Depot Hotel
  1439. Old Union Meetinghouse
  1440. Old Union Methodist Church
  1441. Old Union School (Birdell, Arkansas)
  1442. Old Union School (Chesterville, Ohio)
  1443. Old Union School (Coshocton, Ohio)
  1444. Old United States Courthouse and Post Office (Frankfort, Kentucky)
  1445. Old United States Customshouse and Post Office and Fireproof Storage Company Warehouse
  1446. Old United States Post Office (Philadelphia, Mississippi)
  1447. Old United States Post Office and Courthouse (Miami, Florida)
  1448. Old United States Post Office and Courts Building (Jefferson, Texas)
  1449. Old University Library
  1450. Old University of Alabama Observatory
  1451. Old Upper Springfield Friends Burying Ground
  1452. Old Uptown Historic District (Harrisburg)
  1453. Old Urban Cemetery
  1454. Old Ursuline Convent, New Orleans
  1455. Old Vanderburgh County Courthouse
  1456. Old Vatia
  1457. Old Vero Beach Community Building
  1458. Old Vicksburg Bridge
  1459. Old Village Historic District (Chatham, Massachusetts)
  1460. Old Village Historic District (Monroe, Michigan)
  1461. Old WRUF Radio Station
  1462. Old Wadena Historic District
  1463. Old Wakulla County Courthouse
  1464. Old Walnut Ridge Post Office
  1465. Old Wappingers Falls Village Hall
  1466. Old Warner Brothers Studio
  1467. Old Warren County Courthouse
  1468. Old Warren County Courthouse Complex
  1469. Old Warrick County Jail
  1470. Old Washington County Courthouse (Oklahoma)
  1471. Old Washington County Courthouse (Utah)
  1472. Old Washington County Library
  1473. Old Water and Electric Light Plant
  1474. Old Watertown High School
  1475. Old Waterville High School
  1476. Old Waterville Post Office
  1477. Old Watson Homestead House
  1478. Old Wayne County High School
  1479. Old Weber Implement and Automobile Company
  1480. Old Webster Meeting House
  1481. Old Webster Schoolhouse
  1482. Old Weir Stove Building
  1483. Old Welbourne Farm and Dulany Family Cemetery
  1484. Old West Austin Historic District
  1485. Old West Baltimore Historic District
  1486. Old West Church (Boston, Massachusetts)
  1487. Old West Church (Calais, Vermont)
  1488. Old West End District (Toledo, Ohio)
  1489. Old West End Historic District (Muncie, Indiana)
  1490. Old West Haven High School
  1491. Old West Palm Beach National Guard Armory
  1492. Old West Salem City Hall
  1493. Old West Side Historic District
  1494. Old West, Dickinson College
  1495. Old Westbrook High School
  1496. Old Westbury Gardens
  1497. Old Westfield Cemetery
  1498. Old Wethersfield
  1499. Old Whaler's Church (Sag Harbor)
  1500. Old White Church Cemetery
  1501. Old White County Courthouse
  1502. Old White Meeting House Ruins and Cemetery
  1503. Old White Mill
  1504. Old Wilkes County Jail
  1505. Old Willow Community Center
  1506. Old Wilson Historic District
  1507. Old Wing Mission
  1508. Old Winona Middle School
  1509. Old Winters Ranch/Winters Mansion
  1510. Old Woodruff High School (Woodruff, South Carolina)
  1511. Old World Third Street Historic District
  1512. Old Worth County Courthouse (Iowa)
  1513. Old Wye Church
  1514. Old Wythe Historic District
  1515. Old York Gaol
  1516. Old Zion Methodist Church
  1517. Olde Town Arvada
  1518. Olde Woolen Mill
  1519. Oldenburg Historic District
  1520. Oldfields
  1521. Oldham Methodist Church
  1522. Olds Hall
  1523. Olds, Wortman & King
  1524. Oldtown Covered Bridge
  1525. Oldwick Historic District
  1526. Ole Arilsen House
  1527. Ole Bohman House
  1528. Ole Carlson House
  1529. Ole Crogen Farm District
  1530. Ole K. Roe House
  1531. Ole and Polly Oleson Farmhouse
  1532. Olean Armory
  1533. Olean Public Library
  1534. Olean Railroad Depot
  1535. Olean School No. 10
  1536. Olema Lime Kilns
  1537. Olema Valley Dairy Ranches Historic District
  1538. Oleson Park Music Pavilion
  1539. Oley Township, Pennsylvania
  1540. Oliphant–Walker House
  1541. Olivas Adobe
  1542. Olive Branch High School (New Carlisle, Ohio)
  1543. Olive Branch Methodist Episcopal Church
  1544. Olive Branch Missionary Baptist Church
  1545. Olive Chapel African Methodist Episcopal Church
  1546. Olive Furnace
  1547. Olive Hill (Matoaca, Virginia)
  1548. Olive Hill station
  1549. Olive Hotel
  1550. Olive Jeanette
  1551. Olive Township District No. 1 School
  1552. Olive and Hurley Old School Baptist Church
  1553. Olivenhain Town Meeting Hall
  1554. Oliver A. Wickes House
  1555. Oliver Avenue Bridge
  1556. Oliver Barrett House
  1557. Oliver Blood House
  1558. Oliver Brewster House
  1559. Oliver Bronson House
  1560. Oliver Building (Billings, Montana)
  1561. Oliver Building (Chicago)
  1562. Oliver Chace's Thread Mill
  1563. Oliver Ellsworth Homestead
  1564. Oliver Filley House
  1565. Oliver G. Traphagen House
  1566. Oliver H. Bair Funeral Home
  1567. Oliver H. Hovda House
  1568. Oliver Hastings House
  1569. Oliver Hazard Perry Graded School
  1570. Oliver High School
  1571. Oliver Hill Building
  1572. Oliver House (Corning, Arkansas)
  1573. Oliver House (Wakefield, Massachusetts)
  1574. Oliver House, Toledo, Ohio
  1575. Oliver Hutchins House
  1576. Oliver Johnson's Woods Historic District
  1577. Oliver Kelley Farm
  1578. Oliver L. and Catherine Link House
  1579. Oliver Mill Park
  1580. Oliver Miller Homestead
  1581. Oliver O. Stokes House
  1582. Oliver P. Morton House
  1583. Oliver Rice House
  1584. Oliver Street Historic District
  1585. Oliver Sturges House
  1586. Oliver W. Mills House
  1587. Oliver Warner Farmstead
  1588. Oliver Wendell Holmes House
  1589. Oliver White Tavern
  1590. Oliver Whiting Homestead
  1591. Oliver Wight House
  1592. Oliver Wiswall House
  1593. Oliver Wolcott House
  1594. Oliver and Gertrude Lundquist House
  1595. Oliver and Lucy Bonnell Gothic Arch Roofed Barn
  1596. Oliver and Margaret Jeffrey House
  1597. Oliver's Gift (log canoe)
  1598. Oliver-Leming House
  1599. Oliver–Eakle–Barfield Building
  1600. Oliver–Morton Farm
  1601. Olivet Chapel
  1602. Olivet Presbyterian Church
  1603. Olivet United Methodist Church, Parsonage and School
  1604. Olivia Apartments
  1605. Oljato Trading Post
  1606. Ollinger-Cobb House
  1607. Olmstead Place State Park
  1608. Olmstead Street Historic District
  1609. Olmstead station
  1610. Olmsted Family Farmhouse
  1611. Olmsted Station Powerhouse
  1612. Olmsted Subdivision Historic District
  1613. Olmsted-Hixon-Albion Block
  1614. Olney (Joppa, Maryland)
  1615. Olney Carnegie Library
  1616. Olney Cook Artisan Shop
  1617. Olney Elementary School
  1618. Olney Friends School
  1619. Olney High School
  1620. Olney Street–Alumni Avenue Historic District
  1621. Olof Johnson House
  1622. Olompali State Historic Park
  1623. Olsen House (Helena, Montana)
  1624. Olson House (Cushing, Maine)
  1625. Oltjenbruns Farm
  1626. Oluf Larsen House
  1627. Olustee Battlefield Historic State Park
  1628. Olympia Apartments (Washington, D.C.)
  1629. Olympia Armory
  1630. Olympia Downtown Historic District
  1631. Olympia Fields Country Club
  1632. Olympia Mill
  1633. Olympia School
  1634. Olympia Theater (Miami)
  1635. Olympic Apartment Building
  1636. Olympic Avenue Bridge
  1637. Olympic Cereal Mill
  1638. Olympic Club Hotel
  1639. Olympic National Park Headquarters Historic District
  1640. Olympus Guard Station
  1641. Olzie Whitehead Williams House
  1642. Omaha Bolt, Nut and Screw Building
  1643. Omaha Central High School
  1644. Omaha Ford Motor Company Assembly Plant
  1645. Omaha Hotel
  1646. Omaha National Bank Building
  1647. Omaha Public Library (building)
  1648. Omaha Quartermaster Depot Historic District
  1649. Omaha Rail and Commerce Historic District
  1650. Omaha Star building
  1651. Omaha Union Station
  1652. Omaha station (Chicago, Burlington and Quincy Railroad)
  1653. Omar Chapel
  1654. Omega Chapter of the Chi Phi Fraternity
  1655. Omena Historic District
  1656. Omni Bedford Springs Resort
  1657. Omni William Penn Hotel
  1658. Omohundro Water Treatment Plant
  1659. Omro Village Hall and Engine House
  1660. On the Hill (Boydton, Virginia)
  1661. Onancock Historic District
  1662. Onawa IOOF Opera House
  1663. Onawa Public Library
  1664. Onaway State Park
  1665. Onderdonk House
  1666. One Calvert Plaza
  1667. One Charles Center
  1668. One Main Place (Dallas)
  1669. One Moody Plaza
  1670. One North LaSalle
  1671. One Pendleton Place
  1672. One Thirty North Eighth Building
  1673. One-Million-Liter Test Sphere
  1674. Oneida Armory
  1675. Oneida Community Mansion House
  1676. Oneida Cotton Mills and Scott-Mebane Manufacturing Company Complex
  1677. Oneida County Courthouse (Idaho)
  1678. Oneida County Courthouse (Wisconsin)
  1679. Oneida Lake Congregational Church
  1680. Oneida Milling and Elevator Company Grain Elevator
  1681. Oneida Stake Academy
  1682. Oneida Street Station
  1683. Oneonta Armory
  1684. Oneonta Downtown Historic District
  1685. Oneonta Theatre
  1686. Onesquethaw Valley Historic District
  1687. Ongeluluul
  1688. Onion Creek Bridge (Coffeyville, Kansas)
  1689. Onion Portage Archeological District
  1690. Onon B. and Betsy Dahle House
  1691. Onondaga Highlands–Swaneola Heights Historic District
  1692. Onondaga Park
  1693. Onota, Au Train Township, Michigan
  1694. Onslow Gilmore House
  1695. Ontario Apartments
  1696. Ontario Heritage Square
  1697. Ontario State Bank Block
  1698. Ontario and Livingston Mutual Insurance Office
  1699. Ontario station (Oregon)
  1700. Onteora Park Historic District
  1701. Ontonagon County Courthouse
  1702. Ontonagon Harbor Piers Historic District
  1703. Ontonagon Light
  1704. Ontonagon School
  1705. Onyx Cave (Newburg, Missouri)
  1706. Oolenoy Baptist Church Cemetery
  1707. Ooten House
  1708. Opa-locka Bank
  1709. Opa-locka Company administration building
  1710. Opa-locka station
  1711. Opal's Steak House
  1712. Opana Radar Site
  1713. Opatrny Village Site
  1714. Opelousas Historic District
  1715. Open Air School (Columbus, Ohio)
  1716. Opequon Golf Club
  1717. Opequon Historic District
  1718. Opequon Presbyterian Church
  1719. Opera Block
  1720. Opera Hall Block (King City, Missouri)
  1721. Opera House and Yates Bookshop Building
  1722. Opera House at Boothbay Harbor
  1723. Opera House–Starnes Jewelers Building
  1724. Operation Crossbow Site
  1725. Operation Elster
  1726. Operations and Checkout Building
  1727. Ophir Town Hall
  1728. Opp Cottage
  1729. Oppenheim and St. Johnsville Union Society Church
  1730. Opposition House
  1731. Opus 40
  1732. Oquawka Wagon Bridge
  1733. Oquirrh School
  1734. Oquossoc Log Church
  1735. Ora Adams House
  1736. Ora Blanchard House
  1737. Ora Holland House
  1738. Ora Pelton House
  1739. Oracle State Park
  1740. Oracle Union Church
  1741. Oradell station
  1742. Oraibi, Arizona
  1743. Oram Nincehelser House
  1744. Oran Community Church
  1745. Oran District No. 22 Schoolhouse
  1746. Orange Armory
  1747. Orange Center Historic District (Orange, Connecticut)
  1748. Orange Center Historic District (Orange, Massachusetts)
  1749. Orange City Historic District
  1750. Orange City Town Hall
  1751. Orange Commercial Historic District
  1752. Orange County Courthouse (Indiana)
  1753. Orange County Courthouse (Virginia)
  1754. Orange Cove station (Atchison, Topeka and Santa Fe Railway)
  1755. Orange Grove (Dalzell, South Carolina)
  1756. Orange Grove Court
  1757. Orange Grove Plantation (Saint Helena Island, South Carolina)
  1758. Orange Grove Plantation House (Terrebonne Parish, Louisiana)
  1759. Orange Hall (St. Marys, Georgia)
  1760. Orange High School (Orange, California)
  1761. Orange High School (Orange, Virginia)
  1762. Orange Mill Historic District
  1763. Orange Park Elementary School
  1764. Orange Park Negro Elementary School
  1765. Orange Public Library
  1766. Orange Springs
  1767. Orange Springs Methodist Episcopal Church and Cemetery
  1768. Orange Street Historic District
  1769. Orange Street Presbyterian Church
  1770. Orange Street School
  1771. Orange Vale
  1772. Orange and Alexandria Railroad Bridge Piers
  1773. Orange and Alexandria Railroad Hooff's Run Bridge
  1774. Orange station (NJ Transit)
  1775. Orangeburg City Cemetery
  1776. Orangeburg County Fair Main Exhibit Building
  1777. Orangeburg County Jail
  1778. Orangeburg Downtown Historic District
  1779. Orators Mound
  1780. Orchard Beach State Park
  1781. Orchard House
  1782. Orchard Park station
  1783. Orchard Street United Methodist Church
  1784. Orchestra Hall (Detroit)
  1785. Oregon Caves Chateau
  1786. Oregon Caves Historic District
  1787. Oregon City Bridge
  1788. Oregon City Carnegie Library
  1789. Oregon City Municipal Elevator
  1790. Oregon Commercial Company Building
  1791. Oregon Commercial Historic District
  1792. Oregon Cracker Company Building
  1793. Oregon Creek Covered Bridge
  1794. Oregon Electric Railway Passenger Station
  1795. Oregon Film Museum
  1796. Oregon Hill
  1797. Oregon Historic District
  1798. Oregon Inlet Station
  1799. Oregon Iron Company Furnace
  1800. Oregon Masonic Hall (Oregon, Wisconsin)
  1801. Oregon Mill Complex
  1802. Oregon Pacific Railroad (1880–1894)
  1803. Oregon Portland Cement Building
  1804. Oregon Public Library
  1805. Oregon Railway and Navigation Company Bridge
  1806. Oregon Route 242
  1807. Oregon Shortline Railroad Company Building
  1808. Oregon State Bank Building
  1809. Oregon State Capitol
  1810. Oregon State Fair
  1811. Oregon State Forester's Office Building
  1812. Oregon State Hospital Historic District
  1813. Oregon State Soldier's Home Hospital
  1814. Oregon State University
  1815. Oregon Supreme Court Building
  1816. Oregon Trail (Ada County, Idaho segment)
  1817. Oregon Trail Ruts
  1818. Oregon Trail, Wells Springs Segment
  1819. Oregon Water Tower and Pump House
  1820. Oregon station (Illinois)
  1821. Orem's Delight
  1822. Oren F. and Adelia Parker House
  1823. Orenda/SP-26 Historic District, Chopawamsic RDA Camp 3
  1824. Orendorf Site
  1825. Orford Street Historic District
  1826. Orfordville Depot
  1827. Organ Cave
  1828. Orgonon
  1829. Orie J. Smith Black and White Stock Farm Historic District
  1830. Orient Baptist Church
  1831. Orient Bridge
  1832. Orient Historic District
  1833. Orient Manufacturing Company-Chadwick-Hoskins No. 3
  1834. Orient Point Light
  1835. Oriental Apartments
  1836. Oriental Building Association No. 6 Building
  1837. Oriental Lodge No. 500
  1838. Oriental Mills
  1839. Oriental Textile Mill
  1840. Oriental Theater (Denver)
  1841. Oriental Theatre (Milwaukee)
  1842. Orient–Fosterville Border Crossing
  1843. Original Church of God (Pulaski, Tennessee)
  1844. Original Congregational Church of Wrentham
  1845. Original Highlands, Louisville
  1846. Original Main Street Historic District
  1847. Original Newburgh Historic District
  1848. Original Springs Hotel and Bathhouse
  1849. Original Town of Fernandina Historic Site
  1850. Original Townsite Historic District
  1851. Original Wasco County Courthouse
  1852. Orin Clark House
  1853. Orin Jordan House
  1854. Orin Savage Cottage
  1855. Orion Clemens House
  1856. Oriskany Battlefield State Historic Site
  1857. Orkney Springs Hotel
  1858. Orland P. Bassett House
  1859. Orlando (Andover, Massachusetts)
  1860. Orlando Brice House
  1861. Orlando H. and Emma H. Hardcastle House
  1862. Orlando Health/Amtrak station
  1863. Orlando Humason House
  1864. Orlando Utilities Commission Administration Building
  1865. Orlando W. Warner House
  1866. Orlean Historic District
  1867. Orleans County Courthouse Historic District
  1868. Orleans County Courthouse and Jail Complex
  1869. Orleans Historic District
  1870. Orman-Adams House
  1871. Ormond Fire House
  1872. Ormond Hotel
  1873. Ormond Plantation House
  1874. Ormond Yacht Club
  1875. Ormonde (Cazenovia, New York)
  1876. Ormonde Apartment Building
  1877. Ormsby-Kelly House
  1878. Ormsby-Laughlin Textile Companies Mill
  1879. Ormsby–Rosser House
  1880. Orna Villa
  1881. Orndoff-Cross House
  1882. Orne Covered Bridge
  1883. Orofino Historic District
  1884. Orono Main Street Historic District
  1885. Orono Post Office
  1886. Orosi Branch Library
  1887. Orote Field
  1888. Orote Historical Complex
  1889. Oroville Carnegie Library
  1890. Oroville Chinese Temple
  1891. Orpheum Lofts
  1892. Orpheum Theater (New Orleans)
  1893. Orpheum Theater (Sioux Falls)
  1894. Orpheum Theater (St. Louis)
  1895. Orpheum Theatre (Champaign, Illinois)
  1896. Orpheum Theatre (Madison, Wisconsin)
  1897. Orpheum Theatre (Memphis)
  1898. Orpheum Theatre (Minneapolis)
  1899. Orpheum Theatre (Omaha)
  1900. Orpheum Theatre (Phoenix, Arizona)
  1901. Orpheum Theatre (Sioux City, Iowa)
  1902. Orpheum Theatre (Wichita, Kansas)
  1903. Orr Iron Company
  1904. Orr Roadside Parking Area
  1905. Orr School
  1906. Orr-Herl Mound and Village Site
  1907. Orrin B. Hartley House
  1908. Orrin Hoadley House
  1909. Orrin Todd House
  1910. Orrin W. Burritt House
  1911. Orrin White House
  1912. Orrin and Roxanne Fairman Kinyon House
  1913. Orsel and Minnie McGhee House
  1914. Orson Ames House
  1915. Orson Everitt House
  1916. Orson Grimmett Bungalow
  1917. Orson Pratt House
  1918. Orson Rogers House
  1919. Ortega (Jacksonville)
  1920. Orth C. Galloway House
  1921. Orth House
  1922. Orthodox Meetinghouse
  1923. Ortiz House (Yuma, Arizona)
  1924. Orton Memorial Laboratory
  1925. Orton Park
  1926. Orton Park Historic District
  1927. Orton Plantation
  1928. Ortonville Mill
  1929. Orvall Gammill Barn
  1930. Orville Beach Memorial Manual Training School
  1931. Orville Jackson House
  1932. Orville P. and Sarah Chubb House
  1933. Orville T. Waring House
  1934. Orvis Road Historic District
  1935. Orwell Site (Orwell, Vermont)
  1936. Orwell site (Fergus Falls, Minnesota)
  1937. Osage Bank of Fairfax
  1938. Osage Commercial Historic District
  1939. Osage County Courthouse (Kansas)
  1940. Osage County Poorhouse
  1941. Osage Farms Resettlement Properties in Pettis County, Missouri
  1942. Osage Mills Dam
  1943. Osage Mission Infirmary
  1944. Osage Village State Historic Site
  1945. Osborn Hotel
  1946. Osborn House
  1947. Osborn Street School
  1948. Osborne Homestead Museum
  1949. Osborne House (Victor, New York)
  1950. Osborne Public Carnegie Library
  1951. Osborne Wells House
  1952. Osborn–Bennett Historic District
  1953. Osborn–Bouton–Mead House
  1954. Oscar Anderson House Museum
  1955. Oscar Blomeen House
  1956. Oscar C. Diehl House
  1957. Oscar C. Woods House
  1958. Oscar Carlson House
  1959. Oscar Chambers House
  1960. Oscar Crow House
  1961. Oscar Easley Block
  1962. Oscar F. Lyons House
  1963. Oscar Foss Memorial Library
  1964. Oscar G. Johnson VA Medical Center
  1965. Oscar G. and Mary H. Burch House
  1966. Oscar Gill House
  1967. Oscar Hammerstein II Farm
  1968. Oscar Leibhart Site
  1969. Oscar Lindsay House
  1970. Oscar M. Booth House
  1971. Oscar Nichols House
  1972. Oscar Redman Building
  1973. Oscar Roeser House
  1974. Oscar Stanton De Priest House
  1975. Oscar Taylor House
  1976. Oscar W. Underwood House
  1977. Oscar and Christina Beckman Farmstead
  1978. Oscar-Zero Missile Alert Facility
  1979. Osceola Apartment Hotel
  1980. Osceola Commercial Historic District
  1981. Osceola County Courthouse (Florida)
  1982. Osceola County Courthouse (Iowa)
  1983. Osceola Ditch
  1984. Osceola Park Historic Residential District
  1985. Osceola Public School Building
  1986. Osceola Times Building
  1987. Osceola Town Hall
  1988. Osceola station
  1989. Osceola station (Wisconsin)
  1990. Osgood Bradley Building
  1991. Osgood Building
  1992. Osgood Ditch
  1993. Osgood Family House
  1994. Osgood Farm
  1995. Osgood Gamekeeper's Lodge
  1996. Osgood Hill
  1997. Osgood–Kuhnhausen House
  1998. Oshkosh Grand Opera House
  1999. Oshkosh Northwestern
  2000. Oshkosh Water Tower
  2001. Oshtemo Town Hall
  2002. Oskaloosa City Hall
  2003. Oskaloosa City Park and Band Stand
  2004. Oskaloosa City Square Commercial Historic District
  2005. Oskaloosa Fire Station
  2006. Oskaloosa Monthly Meeting of Friends Parsonage
  2007. Oskaloosa Post Office
  2008. Oskaloosa Public Library
  2009. Oskaloosa station
  2010. Oskar G. Stonorov House
  2011. Osmund Osmundson House
  2012. Osmyn and Emily Deuel House
  2013. Osprey School
  2014. Osprey Site
  2015. Ossabaw Island
  2016. Osseo Water Tower
  2017. Ossian H. Sweet House
  2018. Ossian Opera House
  2019. Ossian Wilbur Goss Reading Room
  2020. Ossoli Circle
  2021. Ost Valle Bridge
  2022. Osterburg Covered Bridge
  2023. Osterhoudt Stone House
  2024. Osterman and Tremaine Building
  2025. Osterville Baptist Church
  2026. Oswald J. Nitschke House
  2027. Oswegatchie Historic District
  2028. Oswegatchie Pumping Station
  2029. Oswego Armory
  2030. Oswego City Hall
  2031. Oswego City Library
  2032. Oswego County Courthouse
  2033. Oswego Harbor West Pierhead Light
  2034. Oswego Meeting House and Friends' Cemetery
  2035. Oswego Public Library
  2036. Oswego Theater
  2037. Oswego United States Post Office
  2038. Oswego Yacht Club
  2039. Oswego–Oneida Streets Historic District
  2040. Oteen Veterans Administration Hospital Historic District
  2041. Otero's 66 Service
  2042. Otha Walker Homestead
  2043. Other C. Wamsley House
  2044. Othniel Looker House
  2045. Otho Poole House
  2046. Otis Angell Gristmill
  2047. Otis Cary House
  2048. Otis Center Historic District
  2049. Otis Company Mill No. 1
  2050. Otis Elevator Company Building (Portland, Oregon)
  2051. Otis Elevator Company Factory Building
  2052. Otis Hare Archeological Site
  2053. Otis Hotel
  2054. Otis L. Brown House
  2055. Otis Park and Golf Course
  2056. Otis Putnam House
  2057. Otis Starkey House
  2058. Otis Theodore and Effiegene Locke Wingo House
  2059. Otis-Wyman House
  2060. Otoe County Courthouse
  2061. Otowi Historic District
  2062. Otowi Suspension Bridge
  2063. Otranto Plantation
  2064. Otranto Plantation Indigo Vats
  2065. Otsdawa Baptist Church
  2066. Otsego Apartments
  2067. Otsego County Courthouse
  2068. Ott's Assay Office
  2069. Ott's Chapel
  2070. Ottari Sanitarium
  2071. Ottauquechee River Bridge
  2072. Ottawa (tug)
  2073. Ottawa Beach Historic District
  2074. Ottawa Commercial Historic District
  2075. Ottawa East Side Historic District
  2076. Ottawa High School and Junior High School
  2077. Ottawa Library (Kansas)
  2078. Ottawa Street Power Station
  2079. Ottawa Waterworks Building
  2080. Ottendorfer Public Library and Stuyvesant Polyclinic Hospital
  2081. Otter Creek Archaeological Site (Ferrum, Virginia)
  2082. Otter Creek Bridge (Cedar Vale, Kansas)
  2083. Otter Creek Bridge (Oelwein, Iowa)
  2084. Otter Lake Community Church
  2085. Otter Spring House
  2086. Otter Tail County Courthouse
  2087. Otterbein Church (Baltimore, Maryland)
  2088. Otterbein Church (Evans, West Virginia)
  2089. Otterburn (Bedford, Virginia)
  2090. Otto Brinkmann House
  2091. Otto Carmichael House
  2092. Otto H. Baring House
  2093. Otto Huechling House
  2094. Otto J. Hager House
  2095. Otto Schlemmer Building
  2096. Otto Sr. and Lisette Hahn House
  2097. Otto W. and Ida L. Nelson House
  2098. Otto and Hilda Gretzinger House
  2099. Otto and Verdell Rutherford House
  2100. Ottumwa Cemetery
  2101. Ottumwa City Hall
  2102. Ottumwa Public Library
  2103. Ottumwa Regional Airport
  2104. Ottumwa Young Women's Christian Association
  2105. Ottumwa station
  2106. Otway Covered Bridge
  2107. Otway Henderson House
  2108. Otwell (Oxford, Maryland)
  2109. Ouachita Avenue Historic District
  2110. Ouachita County Courthouse
  2111. Ouachita Parish High School
  2112. Ouachita River Bridge (Arkadelphia, Arkansas)
  2113. Ouachita River Lock and Dam No. 8
  2114. Ouaquaga Lenticular Truss Bridge
  2115. Ouilmette North Historic District
  2116. Oulagisket
  2117. Our Lady Help of Christians Chapel (Cheektowaga, New York)
  2118. Our Lady Help of Christians Historic District (Newton, Massachusetts)
  2119. Our Lady of Good Voyage Church (Gloucester, Massachusetts)
  2120. Our Lady of Grace Church (Reserve, Louisiana)
  2121. Our Lady of Guadaloupe Church
  2122. Our Lady of Guadalupe Church (San Jose, California)
  2123. Our Lady of Guadalupe Church and Medina Cemetery
  2124. Our Lady of Limerick Catholic Church (Glenns Ferry, Idaho)
  2125. Our Lady of Loretto Roman Catholic Church and Cemetery
  2126. Our Lady of Lourdes Church (Victoria, Texas)
  2127. Our Lady of Lourdes Church Complex
  2128. Our Lady of Mercy Chapel
  2129. Our Lady of Mercy High School (Ohio)
  2130. Our Lady of Mount Carmel Grotto
  2131. Our Lady of Mt. Carmel Church
  2132. Our Lady of Perpetual Help Church (Altus, Arkansas)
  2133. Our Lady of Perpetual Help Roman Catholic Church
  2134. Our Lady of Purification Catholic Church
  2135. Our Lady of Sorrows Catholic Church (Rock Springs, Wyoming)
  2136. Our Lady of Sorrows Chapel
  2137. Our Lady of Sorrows Church (Bernalillo, New Mexico)
  2138. Our Lady of Sorrows Church (Las Vegas, New Mexico)
  2139. Our Lady of Victory Academy (Fort Worth, Texas)
  2140. Our Lady of Victory Catholic Church (Pearce, Arizona)
  2141. Our Lady of Victory Roman Catholic Church
  2142. Our Lady of the Angels Academy
  2143. Our Lady of the Angels School (Albuquerque, New Mexico)
  2144. Our Lady of the Annunciation Chapel at Annunciation Priory
  2145. Our Lady of the Assumption School
  2146. Our Lady of the Blessed Sacrament Church
  2147. Our Lady of the Ozarks Shrine
  2148. Our Lady of the Rosary Church (Detroit)
  2149. Our Lady of the Wayside Church
  2150. Our Lady, Queen of Heaven Church
  2151. Our Mother of Mercy Catholic Church and Parsonage
  2152. Our Mother of Sorrows Grotto Historic District
  2153. Our Mother of Sorrows Monastery and Retreat Center (West Springfield, Massachusetts)
  2154. Our Mother of Sorrows Roman Catholic Church Complex
  2155. Our Savior's Kvindherred Lutheran Church (Calamus, Iowa)
  2156. Our Savior's Lutheran Church (Menno, South Dakota)
  2157. Our Savior's Scandinavian Lutheran Church
  2158. Our Saviour's Evangelical Lutheran Church
  2159. Ourant's School
  2160. Ouray City Hall and Walsh Library
  2161. Ouray Historic District
  2162. Out-of-Door Academy
  2163. Outdoor Art Club
  2164. Outing Club
  2165. Outing Park Historic District
  2166. Outlands in the Eighty Acres
  2167. Outlaw Inn
  2168. Outlet Mound
  2169. Outlook station (Montana)
  2170. Over-the-Jumps Carousel
  2171. Over-the-Rhine
  2172. Overackers Corners Schoolhouse
  2173. Overbrook (Nashville, Tennessee)
  2174. Overbrook Elementary School
  2175. Overbrook Farms, Philadelphia
  2176. Overbrook High School (Philadelphia)
  2177. Overcarsh House
  2178. Overfield Tavern
  2179. Overholser Mansion
  2180. Overland Waterloo Company Building
  2181. Overlook (Little Falls, New York)
  2182. Overlook (Martinsburg, West Virginia)
  2183. Overlook Castle
  2184. Overlook Historic District
  2185. Overmyer–Waggoner–Roush Farm
  2186. Overseas Highway
  2187. Overstreet Hall
  2188. Overstreet House
  2189. Overton Corners–Lacolle 221 Border Crossing
  2190. Overton Farm
  2191. Overton Gymnasium
  2192. Overton Lane
  2193. Overton Park
  2194. Overtown Historic District
  2195. Oviatt House
  2196. Owasco Reformed Church
  2197. Owatonna Commercial Historic District
  2198. Owatonna Firemen's Hall
  2199. Owatonna Public Library
  2200. Owego Central Historic District
  2201. Owen A. and Emma J. Garretson House
  2202. Owen B. Pickett United States Custom House
  2203. Owen Building (Columbia, South Carolina)
  2204. Owen Chapel Church of Christ
  2205. Owen Coachman House
  2206. Owen County Courthouse (Indiana)
  2207. Owen County Courthouse and Jail
  2208. Owen E. LeFevre House
  2209. Owen Estate
  2210. Owen Family House and Cemetery
  2211. Owen High School
  2212. Owen Lovejoy House
  2213. Owen Martin House
  2214. Owen Moon Farm
  2215. Owen Park, Tulsa
  2216. Owen Plantation House
  2217. Owen Tudor Hedges House
  2218. Owen-Cox House
  2219. Owen-Gay Farm
  2220. Owen-Harrison House
  2221. Owen-Primm House
  2222. Owensville Historic District
  2223. Owens–Thomas House
  2224. Owings House
  2225. Owings Upper Mill
  2226. Owingsville Commercial District and Courthouse Square
  2227. Owl Blacksmith Shop
  2228. Owl's Bend Site
  2229. Owl's Head Historic District
  2230. Owl's Nest
  2231. Owl's Nest Country Place
  2232. Owls Head (Hebron, New Hampshire)
  2233. Owls Head Light
  2234. Owosso Downtown Historic District
  2235. Owsley Bridge
  2236. Owyhee County Courthouse
  2237. Owyhee Dam
  2238. Ox Bow Inn
  2239. Oxbow Archeological District
  2240. Oxbow Historic District
  2241. Oxford Commercial Historic District
  2242. Oxford Congregational Church and Cemetery
  2243. Oxford Courthouse Square Historic District
  2244. Oxford Downtown Historic District
  2245. Oxford Female Institute
  2246. Oxford Furnace
  2247. Oxford Historic District (Georgetown, Kentucky)
  2248. Oxford Historic District (Oxford, Georgia)
  2249. Oxford Historic District (Oxford, Maryland)
  2250. Oxford Historic District (Oxford, North Carolina)
  2251. Oxford Historic District (Oxford, Pennsylvania)
  2252. Oxford Hotel (Denver, Colorado)
  2253. Oxford Hotel (Oxford, Pennsylvania)
  2254. Oxford Hotel (West Baden Springs, Indiana)
  2255. Oxford House (Grand Forks, North Dakota)
  2256. Oxford Industrial Historic District
  2257. Oxford Main Street Historic District
  2258. Oxford Presbyterian Church
  2259. Oxford School (Fairhaven, Massachusetts)
  2260. Oxford Village Historic District
  2261. Oxford station (Baltimore and Ohio Railroad)
  2262. Oxford-Whitney Streets Historic District
  2263. Oxford–Crown Historic District
  2264. Oxley Barn
  2265. Oxmoor Farm
  2266. Oxnard Historic Farm Park
  2267. Oxon Cove Park and Oxon Hill Farm
  2268. Oxon Hill Manor
  2269. Oyster Bay station
  2270. Ozark Courthouse Square Historic District (Ozark, Arkansas)
  2271. Ozark Courthouse Square Historic District (Ozark, Missouri)
  2272. Ozark Iron Furnace Stack
  2273. Ozark Trails Marker at Lake Arthur
  2274. Ozark station (Arkansas)
  2275. Ozette Indian Village Archeological Site
  2276. Ozias Goodwin House
  2277. Ozmer House
  2278. Ozone School