Sovereign-state flags in 1919

Sovereign states

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Afghanistan (from 8 August)
 
Albania
 
Andorra - variant
 
Andorra - variant
 
Argentina
 
Armenia
 
Asir
 
Australia
 
Austria
 
Azerbaijan
 
Belgium
 
Bolivia
 
Brazil
 
Bulgaria
 
Canada
 
Chile
 
China
 
Colombia
 
Costa Rica
 
Cuba
 
Czechoslovakia
 
Denmark
 
Dominican Republic
 
Ecuador
 
El Salvador
 
Republic of Estonia
 
Commune of the Working People of Estonia
 
Ethiopia
 
Finland
 
France
 
Georgia
 
Germany
 
Greece
 
Guatemala
 
Ha'il
 
Haiti
 
Hejaz
 
Honduras
 
Hungary (until 21 March, from 1 to 8 August)
 
Hungary (from 21 March to 1 August)
 
Hungary (from 8 August)
 
Iceland
 
Italy
 
Japan
 
Republic of Latvia
 
Latvian Socialist Soviet Republic
 
Liberia
 
Liechtenstein
 
Lithuania
 
Lithuanian Soviet Socialist Republic
 
Luxembourg
 
Mexico
 
Monaco
 
Mongolia (until October)
 
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
 
Kingdom of Serbs, Croats and Slovenes
 
Siam
 
South Africa
 
Spain
 
Sweden
 
Switzerland
 
Tibet
 
United Kingdom
 
United States
 
Upper Asir
 
Uruguay
 
Venezuela
 
Yemen

Colonies, concessions, possessions, protectorates, mandates and territories

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Territory of New Guinea (Australia)
 
Norfolk Island (Australia)
 
Papua (Australia)
 
Belgian Congo (Belgium)
 
Ruanda-Urundi (Belgium)
 
Tianjin (Belgium)
 
Greenland (Denmark)
 
Anglo-Egyptian Sudan (Egypt and United Kingdom)
 
French Algeria (France)
 
French Cameroon (France)
 
French Equatorial Africa (France)
 
French Guiana (France)
 
French India (France)
 
French Indochina (France)
 
Autonomous Province of Korçë (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)
 
German New Guinea (until 28 June; Germany)
 
German Samoa (Germany)
 
German South-West Africa (until 28 June; Germany)
 
Amoy (Italy)
 
Italian Cyrenaica (Italy)
 
Italian Eritrea (Italy)
 
Italian Somaliland (Italy)
 
Italian Tripolitania (Italy)
 
Shanghai (Italy)
 
Tientsin (Italy)
 
Chongqing (Japan)
 
Japanese Korea (Chōsen) (Japan)
 
Hangzhou (Japan)
 
Hankou (Japan)
 
Karafuto (Japan)
 
Kwantung (Japan)
 
Shashi (Japan)
 
South Seas Mandate (Japan)
 
Suzhou (Japan)
 
Taiwan (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)
 
North Caucasian Emirate (from September; 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 (Russia)
 
Khiva (Russia)
 
Abkhaz Autonomous Soviet Socialist Republic (from 1919; Soviet Union)
 
Tientsin (Soviet Union)
 
Uryankhay Krai (Soviet Union)
 
Elobey, Annobón, and Corisco (Spain)
 
Fernando Poo (Spain)
 
Río Muni (Spain)
 
Spanish Morocco (Spain)
 
Spanish North Africa (Spain)
 
Spanish Sahara (Spain)
 
South West Africa (South Africa)
 
Aden (United Kingdom)
 
Afghanistan (until February; United Kingdom)
 
Afghanistan (until 8 August; 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 Ceylon (United Kingdom)
 
British Cyprus (United Kingdom)
 
British East Africa (United Kingdom)
 
British Guiana (until 1919; United Kingdom)
 
British Guiana (from 1919; United Kingdom)
 
British Honduras (until 1919; United Kingdom)
 
British Honduras (from 1919; 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 Togoland (United Kingdom)
 
British Trinidad and Tobago (United Kingdom)
 
British Western Pacific Territories (United Kingdom)
 
British Windward Islands (United Kingdom)
 
Brunei (United Kingdom)
 
Egypt (United Kingdom)
 
Falkland Islands (United Kingdom)
 
Federated Malay States (United Kingdom)
 
Gambia (United Kingdom)
 
Gibraltar (United Kingdom)
 
Gold Coast (United Kingdom)
 
Graham Land (until 1919; 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)
 
Johor (United Kingdom)
 
Kedah (United Kingdom)
 
Kelantan (United Kingdom)
 
Kuwait (United Kingdom)
 
Maldives (United Kingdom)
 
Malta (United Kingdom)
 
Nepal (United Kingdom)
 
Nigeria (United Kingdom)
 
North Borneo (United Kingdom)
 
Northern Rhodesia (United Kingdom)
 
Nyasaland (until 1919; United Kingdom)
 
Nyasaland (from 1919; United Kingdom)
 
Perlis (United Kingdom)
 
Qatar (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)
 
Straits Settlements (United Kingdom)
 
Suez Canal (until 1919; United Kingdom)
 
Swaziland (United Kingdom)
 
Tanganyika (United Kingdom)
 
Terengganu (United Kingdom)
 
Tientsin (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 (United States)
 
American Samoa (United States)
 
Bajo Nuevo Bank (United States)
 
Corn Islands (United States)
 
Guam (United States)
 
Hawaii (United States)
 
Howland Island (United States)
 
Johnston Atoll (United States)
 
Kingman Reef (United States)
 
Middlebrook Island (United States)
 
Midway Atoll (United States)
 
Navassa Island (United States)
 
Panama Canal Zone (United States)
 
Philippine Islands (United States)
 
Puerto Rico (United States)
 
Quita Sueño 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)
 
Wake Island (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

Sovereign U.S. states

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Alabama
 
Arizona
 
Arkansas
 
California
 
Colorado
 
Connecticut
 
Delaware
 
Florida
 
Georgia
 
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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Alash
 
Alchensk (until 1919)
 
Alchensk (from 1919)
 
Altai
 
Aras
 
Banat Republic
 
Bavaria
 
Belarus (1 January–27 February)
 
Bottleneck (from 10 January)
 
Byelorussian-Lithuanian Soviet Socialist Republic (from 27 February)
 
Crimea
 
Don
 
Hutsul Republic (from 8 January)
 
Idel-Ural
 
Ireland (from 21 January)
 
Kars Republic
 
Komancza (until 20 April)
 
Komancza (from 20 April)
 
Provisional Government of the Republic of Korea (from 1 March)
 
Kuban
 
Lemko Republic
 
Lithuanian Soviet Socialist Republic (until 27 February)
 
North Ingria (from 9 June)
 
Perloja (until 1919)
 
Perloja (from 1919)
 
Saxony
 
Slovakia (16 June–7 July)
 
Syria (from 1919)
 
Tarnobrzeg (until 1919)
 
Tripolitania
 
Uhtua
 
Ukrainian People's Republic (until 10 March)
 
West Ukrainian People's Republic (until 1919)
 
Würzburg (7–9 April)
 
Zakopane (until 1919)

Other culturals

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Buddhism
 
Esperanto