Sovereign-state flags in 1920

Sovereign states

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Afghanistan
 
Albania
 
Andorra - variant
 
Andorra - variant
 
Argentina
 
Armenia
 
Asir
 
Aussa
 
Australia
 
Austria
 
Azerbaijan (until 28 April)
 
Azerbaijan (from 28 April)
 
Belgium
 
Bolivia
 
Brazil
 
Bulgaria
 
Canada
 
Chile
 
China
 
Colombia
 
Costa Rica
 
Cuba
 
Czechoslovakia (until 30 March)
 
Czechoslovakia (from 30 March)
 
Danzig (from 15 November)
 
Denmark
 
Dominican Republic
 
Ecuador
 
El Salvador
 
Estonia
 
Ethiopia
 
Finland
 
Fiume (from 30 December)
 
France
 
Georgia
 
Germany
 
Greece
 
Guatemala
 
Haʾil
 
Haiti
 
Hejaz
 
Honduras
 
Hungary
 
Iceland
 
Italy
 
Japan
 
Kazakh-Kirghiz Autonomous Socialist Soviet Republic (from 8 February)
 
Latvian Socialist Soviet Republic (until 13 January)
 
Liberia
 
Liechtenstein
 
Lithuania
 
Luxembourg
 
Mexico
 
Monaco
 
Mountain Republic
 
Muscat and Oman
 
Nejd and Hasa
 
Netherlands
 
Newfoundland
 
New Zealand
 
Nicaragua
 
Norway
 
Ottoman Empire
 
Panama
 
Paraguay
 
Paraguay
 
Persia
 
Peru
 
Poland
 
Portugal
 
Romania
 
Russia
 
San Marino
 
Serbs, Croats and Slovenes
 
Siam
 
South Africa
 
Spain
 
Sweden
 
Switzerland
 
Tibet
 
United Kingdom
 
United States
 
Upper Asir (until 1920)
 
Uruguay
 
Venezuela
 
Yemen

Colonies, concessions, possessions, protectorates, mandates and territories

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Nauru (from 1920; Australia)
 
New Guinea (Australia)
 
Norfolk Island (Australia)
 
Papua (Australia)
 
Belgian Congo (Belgium)
 
Ruanda-Urundi (Belgium)
 
Tientsin (Belgium)
 
Anglo-Egyptian Sudan (Egypt and United Kingdom)
 
Åland (from 7 May; Finland)
 
Alawite State (from 1 September; France)
 
French Algeria (France)
 
French Cameroon (France)
 
French Chad (from 17 March; France)
 
French Equatorial Africa (France)
 
French Guiana (France)
 
French India (France)
 
French Indochina (France)
 
Autonomous Province of Korçë (until 15 June; France)
 
French Madagascar (France)
 
French Morocco (France)
 
French Polynesia (France)
 
French Somaliland (France)
 
French Togoland (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)
 
Ubangi-Shari (France)
 
Wallis and Futuna (France)
 
Greater Lebanon (from 1 September; France)
 
Saar Basin (from 10 January; France)
 
German Samoa (until 10 January; 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)
 
South Seas Mandate (Japan)
 
Suzhou (Japan)
 
Taiwan (Japan)
 
Tientsin (Japan)
 
Curaçao and Dependencies (Netherlands)
 
Dutch East Indies (Netherlands)
 
Surinam (Netherlands)
 
Cook Islands (New Zealand)
 
Niue (New Zealand)
 
Western Samoa (from April 25, 1920; New Zealand)
 
Sverdrup Islands (Norway)
 
North Caucasian Emirate (until March; Ottoman Empire)
 
Portuguese Cape Verde (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 (until September; Russia)
 
Khiva (until 2 February; Russia)
 
Abkhaz Autonomous Soviet Socialist Republic (Soviet Union)
 
Uryankhay (Russia)
 
Tientsin (until 15 September; Russia)
 
South West Africa (South Africa)
 
Elobey, Annobón, and Corisco (Spain)
 
Fernando Poo (Spain)
 
Río Muni (Spain)
 
Spanish North Africa (Spain)
 
Spanish Sahara (Spain)
 
Spanish Morocco (Spain)
 
Aden (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 Cameroon (United Kingdom)
 
British East Africa (until 23 July; United Kingdom)
 
British Guiana (United Kingdom)
 
British Honduras (United Kingdom)
 
British Leeward Islands (United Kingdom)
 
British Somaliland (United Kingdom)
 
British Togoland (United Kingdom)
 
British Western Pacific Territories (United Kingdom)
 
British Windward Islands (United Kingdom)
 
Brunei (United Kingdom)
 
Ceylon (United Kingdom)
 
Cyprus (United Kingdom)
 
Egypt (United Kingdom)
 
Falkland Islands (United Kingdom)
 
Federated Malay States (United Kingdom)
 
Gambia (United Kingdom)
 
Gibraltar (United Kingdom)
 
Gold Coast (United Kingdom)
 
Guernsey (United Kingdom)
 
Hankou (United Kingdom)
 
Heard Island and McDonald Islands (United Kingdom)
 
British Hong Kong (United Kingdom)
 
British India (from 10 January; United Kingdom)
 
Isle of Man (United Kingdom)
 
Jamaica (United Kingdom)
 
Kenya (from 11 June; United Kingdom)
 
Jarvis Island (United Kingdom)
 
Jersey (United Kingdom)
 
Jiujiang (United Kingdom)
 
Johor (United Kingdom)
 
Kedah (United Kingdom)
 
Kelantan (United Kingdom)
 
Kuwait (United Kingdom)
 
Maldives (United Kingdom)
 
Malta (United Kingdom)
 
Mauritius (United Kingdom)
 
Nepal (United Kingdom)
 
Nigeria (United Kingdom)
 
North Borneo (United Kingdom)
 
Northern Rhodesia (United Kingdom)
 
Nyasaland (United Kingdom)
 
Palestine (from 25 April; United Kingdom)
 
Perlis (United Kingdom)
 
Qatar (United Kingdom)
 
Saar Basin (from 10 January; United Kingdom)
 
Saint Helena (United Kingdom)
 
Sarawak (United Kingdom)
 
Seychelles (United Kingdom)
 
Sierra Leone (United Kingdom)
 
Sikkim (United Kingdom)
 
South Orkney Islands (United Kingdom)
 
Southern Rhodesia (United Kingdom)
 
South Shetland Islands (United Kingdom)
 
Straits Settlements (United Kingdom)
 
Suez Canal Zone (United Kingdom)
 
Swaziland (United Kingdom)
 
Tanganyika (United Kingdom)
 
Terengganu (United Kingdom)
 
Tientsin (United Kingdom)
 
Trinidad and Tobago (United Kingdom)
 
Tristan da Cunha (United Kingdom)
 
Trucial States (United Kingdom)
 
Uganda (United Kingdom)
 
Union Islands (United Kingdom)
 
Victoria Land (United Kingdom)
 
Weihaiwei (United Kingdom)
 
Zanzibar (United Kingdom)
 
Zhenjiang (United Kingdom)
 
Alaska (United States)
 
American Samoa (United States)
 
Corn Islands (United States)
 
Guam (United States)
 
Hawaii (United States)
 
Howland Island (United States)
 
Johnston Atoll (United States)
 
Kingman Reef (United States)
 
Midway Atoll (United States)
 
Navassa Island (United States)
 
Panama Canal Zone (United States)
 
Petrel Islands (United States)
 
Philippine Islands (United States)
 
Puerto Rico (United States)
 
Quita Sueno Bank (United States)
 
Roncador Bank (United States)
 
Serrana Bank (United States)
 
Serranilla Bank (United States)
 
Swan Islands (United States)
 
United States Virgin Islands (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
 
Arkansas
 
California
 
Colorado
 
Connecticut
 
Delaware
 
Florida
 
Georgia (until 20 January)
 
Georgia (from 20 January)
 
Idaho
 
Illinois
 
Indiana
 
Iowa
 
Kansas
 
Kentucky
 
Louisiana
 
Maine
 
Maryland
 
Massachusetts
 
Michigan
 
Minnesota
 
Mississippi
 
Missouri
 
Montana
 
Nebraska
 
Nevada
 
New Hampshire
 
New Jersey
 
New Mexico
 
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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Åland (from 7 May)
 
Alash (until 26 August)
 
Alash (from 26 August)
 
Alchensk
 
Altai (until 1920)
 
Altai (from 1920)
 
Aras (until 1920)
 
Aras (from 1920)
 
Astana (from 1920)
 
Azadistan (from 1920)
 
Bottleneck
 
Bukhara (from 8 October)
 
Byelorussia (30 July to December)
 
Byelorussian-Lithuanian Soviet Socialist Republic (until 31 July)
 
Carnaro (from 1920)
 
Central Lithuania (from 1920)
 
Don (until 1920)
 
Don (from 1920)
 
Far Eastern Republic (from 6 April)
 
Galicia (15 July to 21 September)
 
Galicia (from 1920)
 
Gilan (from June)
 
Hutsul Republic
 
Idel-Ural (until 1920)
 
Idel-Ural (from 1920)
 
Ireland
 
Jabal Druze State (from 30 May)
 
Karelia (from 20 December)
 
Khorezm (until 26 April)
 
Khorezm (26 to 30 April)
 
Khorezm (from 30 April)
 
Komancza
 
Provisional Government of the Republic of Korea
 
Kuban (until 8 March)
 
Kuban (from 8 March)
 
Lemko Republic (until March)
 
Lemko Republic (from March)
 
North Ingria (until 5 December)
 
North Ingria (from 5 December)
 
Perloja
 
Southern Karelia (May to 20 December)
 
Syria (until 25 July)
 
Uhtua (until 19 December)
 
Ukrainian Socialist Soviet Republic
 
Shanxi chique
 
Ma chinque
 
Yunann chique

Other culturals

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Buddhism
 
Esperanto
 
Pan-African Flag (from 13 August)