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| Bosnia and Herzegovina (until 1 December; Austria-Hungary) |
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| Territory of New Guinea (Australia) |
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| Norfolk Island (Australia) |
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| Papua (Australia) |
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| Belgian Congo (Belgium) |
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| Ruanda-Urundi (Belgium) |
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| Tianjin (Belgium) |
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| Greenland (Denmark) |
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| Iceland (until 1 December; Denmark) |
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| Anglo-Egyptian Sudan (Egypt and United Kingdom) |
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| French Algeria (France) |
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| French Cameroon (France) |
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| French Equatorial Africa (France) |
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| French Guiana (France) |
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| French India (France) |
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| French Indochina (France) |
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| Autonomous Province of Korçë (France) |
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| French Madagascar (France) |
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| French Morocco (France) |
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| French Polynesia (France) |
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| French Somaliland (France) |
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| French Togoland (France) |
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| French Tunisia (France) |
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| French West Africa (France) |
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| Gambier Islands (France) |
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| Guadeloupe (France) |
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| Hankou (France) |
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| Martinique (France) |
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| New Caledonia (France) |
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| New Hebrides (France) |
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| Réunion (France) |
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| Saint Pierre and Miquelon (France) |
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| Shanghai (France) |
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| Tientsin (France) |
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| Ubangi-Shari (France) |
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| Wallis and Futuna (France) |
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| German East Africa (until 25 November; Germany) |
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| German New Guinea (Germany) |
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| German Samoa (Germany) |
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| German South-West Africa (Germany) |
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| Amoy (Italy) |
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| Italian Cyrenaica (Italy) |
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| Italian Eritrea (Italy) |
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| Italian Somaliland (Italy) |
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| Italian Tripolitania (Italy) |
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| Shanghai (Italy) |
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| Tientsin (Italy) |
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| Chongqing (Japan) |
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| Hangzhou (Japan) |
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| Hankou (Japan) |
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| Japanese Korea (Chōsen) (Japan) |
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| Karafuto (Japan) |
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| Kwantung (Japan) |
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| Shashi (Japan) |
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| South Seas Mandate (Japan) |
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| Suzhou (Japan) |
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| Taiwan (Japan) |
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| Isla de la Pasión (Mexico) |
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| Curaçao and Dependencies (Netherlands) |
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| Dutch East Indies (Netherlands) |
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| Surinam (Netherlands) |
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| Cook Islands (New Zealand) |
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| Niue (New Zealand) |
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| Sverdrup Islands (Norway) |
|
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| Portuguese Cape Verde (Portugal) |
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| Portuguese Macau (Portugal) |
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| Portuguese East Africa (Portugal) |
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| Portuguese Guinea (Portugal) |
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| Portuguese India (Portugal) |
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| Portuguese Timor (Portugal) |
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| Portuguese West Africa (Portugal) |
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| Fort of São João Baptista de Ajudá (Portugal) |
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| Portuguese São Tomé and Príncipe (Portugal) |
|
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| Bukhara (Russia) |
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| Idel-Ural (1–28 March; Russia) |
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| Khiva (Russia) |
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| Uryankhay Krai (until mid-1918; Russia) |
|
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| Uryankhay Krai (from mid-1918; Russia) |
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| Tientsin (until 14 April; Russia) |
|
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| Tientsin (14 April; Russia) |
|
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| Tientsin (14 April to 17 June; Russia) |
|
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| Tientsin (from 17 June; Russia) |
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| Elobey, Annobón, and Corisco (Spain) |
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| Fernando Poo (Spain) |
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| Río Muni (Spain) |
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| Spanish Morocco (Spain) |
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| Spanish North Africa (Spain) |
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| Spanish Sahara (Spain) |
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| South West Africa (South Africa) |
|
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| Aden (United Kingdom) |
|
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| Afghanistan (United Kingdom) |
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| Amoy (United Kingdom) |
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| Ascension Island (United Kingdom) |
|
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| Bahamas (United Kingdom) |
|
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| Bahrain (United Kingdom) |
|
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| Baker Island (United Kingdom) |
|
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| Barbados (United Kingdom) |
|
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| Basutoland (United Kingdom) |
|
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| Bechuanaland (United Kingdom) |
|
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| Bermuda (United Kingdom) |
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| Bhutan (United Kingdom) |
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| British Cameroon (United Kingdom) |
|
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| British Ceylon (United Kingdom) |
|
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| British Cyprus (United Kingdom) |
|
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| British East Africa (United Kingdom) |
|
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| British Guiana (United Kingdom) |
|
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| British Honduras (United Kingdom) |
|
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| British Hong Kong (United Kingdom) |
|
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| British Jamaica (United Kingdom) |
|
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| British Leeward Islands (United Kingdom) |
|
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| British Mauritius (United Kingdom) |
|
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| British Somaliland (United Kingdom) |
|
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| British Togoland (United Kingdom) |
|
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| British Trinidad and Tobago (United Kingdom) |
|
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| British Western Pacific Territories (United Kingdom) |
|
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| British Windward Islands (United Kingdom) |
|
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| Brunei (United Kingdom) |
|
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| Egypt (United Kingdom) |
|
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| Falkland Islands (United Kingdom) |
|
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| Federated Malay States (United Kingdom) |
|
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| Gambia (United Kingdom) |
|
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| Gibraltar (United Kingdom) |
|
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| Gold Coast (United Kingdom) |
|
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| Graham Land (United Kingdom) |
|
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| Guernsey (United Kingdom) |
|
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| Hankou (United Kingdom) |
|
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| Heard Island and McDonald Islands (United Kingdom) |
|
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| India (United Kingdom) |
|
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| Isle of Man (United Kingdom) |
|
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| Jarvis Island (United Kingdom) |
|
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| Jersey (United Kingdom) |
|
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| Jiujiang (United Kingdom) |
|
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| Johor (United Kingdom) |
|
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| Kedah (United Kingdom) |
|
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| Kelantan (United Kingdom) |
|
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| Kuwait (United Kingdom) |
|
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| Maldives (United Kingdom) |
|
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| Malta (United Kingdom) |
|
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| Nepal (United Kingdom) |
|
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| Nigeria (United Kingdom) |
|
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| North Borneo (United Kingdom) |
|
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| Northern Rhodesia (United Kingdom) |
|
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| Nyasaland (United Kingdom) |
|
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| Perlis (United Kingdom) |
|
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| Qatar (United Kingdom) |
|
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| Rhodesia (United Kingdom) |
|
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| Saint Helena (United Kingdom) |
|
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| Sarawak (United Kingdom) |
|
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| Seychelles (United Kingdom) |
|
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| Sierra Leone (United Kingdom) |
|
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| Sikkim (United Kingdom) |
|
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| South Orkney Islands (United Kingdom) |
|
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| South Shetland Islands (United Kingdom) |
|
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| Straits Settlements (United Kingdom) |
|
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| Suez Canal (United Kingdom) |
|
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| Swaziland (United Kingdom) |
|
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| Tanganyika (United Kingdom) |
|
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| Terengganu (United Kingdom) |
|
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| Tientsin (United Kingdom) |
|
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| Tristan da Cunha (United Kingdom) |
|
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| Trucial States (United Kingdom) |
|
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| Uganda (United Kingdom) |
|
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| Union Islands (United Kingdom) |
|
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| Victoria Land (United Kingdom) |
|
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| Weihai (United Kingdom) |
|
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| Zanzibar (United Kingdom) |
|
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| Zhenjiang (United Kingdom) |
|
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| Alaska (United States) |
|
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| American Samoa (United States) |
|
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| American Tonga (United States) |
|
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| Bajo Nuevo Bank (United States) |
|
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| California (United States) |
|
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| Corn Islands (United States) |
|
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| Guam (United States) |
|
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| Hawaii (United States) |
|
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| Howland Island (United States) |
|
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| Johnston Atoll (United States) |
|
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| Kingman Reef (United States) |
|
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| Middlebrook Island (United States) |
|
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| Midway Atoll (United States) |
|
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| Navassa Island (United States) |
|
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| Panama Canal Zone (United States) |
|
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| Philippine Islands (United States) |
|
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| Puerto Rico (United States) |
|
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| Quita Sueño Bank (United States) |
|
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| Roncador Bank (United States) |
|
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| Serrana Bank (United States) |
|
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| Serranilla Bank (United States) |
|
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| Swan Islands (United States) |
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| United States Virgin Islands (United States) |
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| Wake Island (United States) |
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