Sovereign-state flags in 1912

Sovereign states

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Albania
 
Andorra - variant
 
Andorra - variant
 
Argentina
 
Aussa
 
Australia
 
Austria-Hungary
 
Belgium
 
Bolivia
 
Brazil
 
Bulgaria
 
Canada
 
Chile
 
China (until 12 February)
 
China (from 12 February)
 
Colombia
 
Costa Rica
 
Crete
 
Cuba
 
Darfur
 
Denmark
 
Dominican Republic
 
Ecuador
 
El Salvador (until 27 May)
 
El Salvador (from 27 May)
 
Ethiopia
 
France
 
Germany
 
Greece
 
Guatemala
 
Ha'il
 
Haiti
 
Honduras
 
Italy
 
Japan
 
Johor Sultanate
 
Liberia
 
Liechtenstein
 
Luxembourg
 
Mbunda
 
Mexico
 
Monaco
 
Mongolia
 
Montenegro
 
Morocco (until 30 March)
 
Muscat and Oman
 
Netherlands
 
Newfoundland
 
New Zealand
 
Nicaragua
 
Norway
 
Ottoman Empire
 
Panama
 
Paraguay
 
Paraguay
 
Persia
 
Peru
 
Portugal
 
Riyadh
 
Romania
 
Russia
 
San Marino
 
Serbia
 
Setul Mambang Segara
 
Siam
 
South Africa (until 1912)
 
South Africa (from 1912)
 
Spain
 
Sulu
 
Sweden
 
Switzerland
 
Tibet (from July)
 
United Kingdom
 
United States (until 4 July)
 
United States (from 4 July)
 
Uruguay
 
Venezuela
 
Wadai (until date unknown)

Colonies, concessions, possessions, protectorates, mandates and territories

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Bosnia and Herzegovina (Austria-Hungary)
 
Papua (Australia)
 
Tianjin (Austria-Hungary)
 
Belgian Congo (Belgium)
 
Tianjin (Belgium)
 
Danish West Indies (Denmark)
 
Greenland (Denmark)
 
Iceland (Denmark)
 
Anglo-Egyptian Sudan (Egypt and United Kingdom)
 
French Algeria (France)
 
French Comoros (France)
 
French Equatorial Africa (France)
 
French Guiana (France)
 
French India (France)
 
French Indochina (France)
 
French Madagascar (France)
 
French Morocco (from 30 March; France)
 
French Polynesia (France)
 
French Somaliland (France)
 
French Tunisia (France)
 
French West Africa (France)
 
Gambier Islands (France)
 
Guadeloupe (France)
 
Hankou (France)
 
Martinique (France)
 
New Caledonia (France)
 
New Hebrides (France)
 
Réunion (France)
 
Saint Pierre and Miquelon (France)
 
Shanghai (France)
 
Tientsin (France)
 
Wallis and Futuna (France)
 
German East Africa (Germany)
 
German Kiautschou (Germany)
 
German New Guinea (Germany)
 
German Samoa (Germany)
 
German South-West Africa (Germany)
 
Hankou (Germany)
 
Kamerun (Germany)
 
Tientsin (Germany)
 
Togoland (Germany)
 
Amoy (Italy)
 
Italian Cyrenaica (Italy)
 
Italian Eritrea (Italy)
 
Italian Somaliland (Italy)
 
Italian Tripolitania (Italy)
 
Shanghai (Italy)
 
Tientsin (Italy)
 
Chongqing (Japan)
 
Hangzhou (Japan)
 
Hankou (Japan)
 
Japanese Korea (Chōsen) (Japan)
 
Karafuto (Japan)
 
Kwantung (Japan)
 
Shashi (Japan)
 
Suzhou (Japan)
 
Taiwan (Japan)
 
Tientsin (Japan)
 
Isla de la Pasión (Mexico)
 
Curaçao and Dependencies (Netherlands)
 
Dutch East Indies (Netherlands)
 
Surinam (Netherlands)
 
Cook Islands (New Zealand)
 
Niue (New Zealand)
 
Sverdrup Islands (Norway)
 
Crete (Ottoman Empire)
 
Egypt (Ottoman Empire)
 
Mecca (Ottoman Empire)
 
Qatar (Ottoman Empire)
 
Samos (until 1912; Ottoman Empire)
 
Scutari (Ottoman Empire)
 
Portuguese Cape Verde (Portugal)
 
Kongo (Portugal)
 
Portuguese Macau (Portugal)
 
Portuguese East Africa (Portugal)
 
Portuguese Guinea (Portugal)
 
Portuguese India (Portugal)
 
Portuguese Timor (Portugal)
 
Portuguese West Africa (Portugal)
 
Fort of São João Baptista de Ajudá (Portugal)
 
Portuguese São Tomé and Príncipe (Portugal)
 
Bukhara (Russia)
 
Khiva (Russia)
 
Tientsin (Russia)
 
Finland (Russia)
 
Elobey, Annobón, and Corisco (Spain)
 
Fernando Poo (Spain)
 
Río Muni (Spain)
 
Spanish Morocco (from 27 November; Spain)
 
Spanish North Africa (Spain)
 
Spanish Sahara (Spain)
 
Aden (United Kingdom)
 
Afghanistan (United Kingdom)
 
Amoy (United Kingdom)
 
Ascension Island (United Kingdom)
 
Bahamas (United Kingdom)
 
Bahrain (United Kingdom)
 
Baker Island (United Kingdom)
 
Barbados (United Kingdom)
 
Basutoland (United Kingdom)
 
Bechuanaland (United Kingdom)
 
Bermuda (United Kingdom)
 
Bhutan (United Kingdom)
 
British Ceylon (United Kingdom)
 
British Cyprus (United Kingdom)
 
British East Africa (United Kingdom)
 
British Guiana (United Kingdom)
 
British Honduras (United Kingdom)
 
British Hong Kong (United Kingdom)
 
British Jamaica (United Kingdom)
 
British Leeward Islands (United Kingdom)
 
British Mauritius (United Kingdom)
 
British Somaliland (United Kingdom)
 
British Trinidad and Tobago (United Kingdom)
 
British Western Pacific Territories (United Kingdom)
 
British Windward Islands (United Kingdom)
 
Brunei (United Kingdom)
 
Falkland Islands (United Kingdom)
 
Federated Malay States (United Kingdom)
 
Fiji (United Kingdom)
 
Gambia (United Kingdom)
 
Gibraltar (United Kingdom)
 
Gold Coast (United Kingdom)
 
Graham Land (United Kingdom)
 
Guernsey (United Kingdom)
 
Hankou (United Kingdom)
 
Heard Island and McDonald Islands (United Kingdom)
 
India (United Kingdom)
 
Isle of Man (United Kingdom)
 
Jarvis Island (United Kingdom)
 
Jersey (United Kingdom)
 
Jiujiang (United Kingdom)
 
Kedah (until mid-1912; United Kingdom)
 
Kedah (from mid-1912; United Kingdom)
 
Kelantan (until mid-1912; United Kingdom)
 
Kelantan (from mid-1912; United Kingdom)
 
Kuwait (United Kingdom)
 
Maldives (United Kingdom)
 
Malta (United Kingdom)
 
Nepal (United Kingdom)
 
North Borneo (United Kingdom)
 
Northern Nigeria (United Kingdom)
 
Northern Rhodesia (United Kingdom)
 
Nyasaland (United Kingdom)
 
Perlis (United Kingdom)
 
Rhodesia (United Kingdom)
 
Saint Helena (United Kingdom)
 
Sarawak (United Kingdom)
 
Seychelles (United Kingdom)
 
Sierra Leone (United Kingdom)
 
Sikkim (United Kingdom)
 
South Orkney Islands (United Kingdom)
 
South Shetland Islands (United Kingdom)
 
Southern Nigeria Protectorate (United Kingdom)
 
Straits Settlements (United Kingdom)
 
Suez Canal (United Kingdom)
 
Swaziland (United Kingdom)
 
Terengganu (United Kingdom)
 
Tristan da Cunha (United Kingdom)
 
Trucial States (United Kingdom)
 
Uganda (United Kingdom)
 
Union Islands (United Kingdom)
 
Victoria Land (United Kingdom)
 
Weihai (United Kingdom)
 
Zanzibar (United Kingdom)
 
Zhenjiang (United Kingdom)
 
Alaska (until 4 July; United States)
 
Alaska (from 4 July; United States)
 
American Samoa (until 4 July; United States)
 
American Samoa (from 4 July; United States)
 
Arizona (until 14 February; United States)
 
Bajo Nuevo Bank (until 4 July; United States)
 
Bajo Nuevo Bank (from 4 July; United States)
 
Guam (until 4 July; United States)
 
Guam (from 4 July; United States)
 
Hawaii (United States)
 
Howland Island (until 4 July; United States)
 
Howland Island (from 4 July; United States)
 
Johnston Atoll (until 4 July; United States)
 
Johnston Atoll (from 4 July; United States)
 
Kingman Reef (until 4 July; United States)
 
Kingman Reef (from 4 July; United States)
 
Middlebrook Island (until 4 July; United States)
 
Middlebrook Island (from 4 July; United States)
 
Midway Atoll (until 4 July; United States)
 
Midway Atoll (from 4 July; United States)
 
Navassa Island (until 4 July; United States)
 
Navassa Island (from 4 July; United States)
 
New Mexico (until 6 January; United States)
 
Palmyra Atoll (until 4 July; United States)
 
Palmyra Atoll (from 4 July; United States)
 
Panama Canal Zone (until 4 July; United States)
 
Panama Canal Zone (from 4 July; United States)
 
Philippine Islands (until 4 July; United States)
 
Philippine Islands (from 4 July; United States)
 
Puerto Rico (until 4 July; United States)
 
Puerto Rico (from 4 July; United States)
 
Quita Sueño Bank (until 4 July; United States)
 
Quita Sueño Bank (from 4 July; United States)
 
Roncador Bank (until 4 July; United States)
 
Roncador Bank (from 4 July; United States)
 
Serrana Bank (until 4 July; United States)
 
Serrana Bank (from 4 July; United States)
 
Serranilla Bank (until 4 July; United States)
 
Serranilla Bank (from 4 July; United States)
 
Swan Islands (until 4 July; United States)
 
Swan Islands (from 4 July; United States)
 
Wake Island (until 4 July; United States)
 
Wake Island (from 4 July; United States)

Australian states

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New South Wales
 
Queensland
 
South Australia
 
Tasmania
 
Victoria
 
Western Australia

Canadian states

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Alberta
 
British Columbia
 
Manitoba
 
New Brunswick
 
Northwest Territories
 
Nova Scotia
 
Ontario
 
Prince Edward Island
 
Quebec
 
Saskatchewan
 
Yukon Territory

Constituent U.S. states

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Alabama
 
Arizona (from 14 February)
 
Arkansas
 
California
 
Colorado
 
Connecticut
 
Delaware
 
Florida
 
Georgia
 
Idaho
 
Illinois
 
Indiana
 
Iowa
 
Kansas
 
Kentucky
 
Louisiana (until 12 April)
 
Louisiana (from 12 April)
 
Maine
 
Maryland
 
Massachusetts
 
Michigan
 
Minnesota
 
Mississippi
 
Missouri
 
Montana
 
Nebraska
 
Nevada
 
New Hampshire
 
New Jersey
 
New Mexico (from 1 January)
 
New York
 
North Carolina
 
North Dakota
 
Ohio
 
Oklahoma
 
Oregon
 
Pennsylvania
 
Rhode Island
 
South Carolina
 
South Dakota
 
Tennessee
 
Texas
 
Utah
 
Vermont
 
Virginia
 
Washington
 
West Virginia
 
Wisconsin
 
Wyoming

Other entities

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Icaria (from 1912)
 
Uryankhay Republic

Other culturals

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Al-Mountada Al-Adabi
 
Buddhism
 
Esperanto