Argentina, Australia, Belgium, Bolivia, Brazil, Byelorussian Soviet Socialist Republic, Canada, Chile, China, Colombia, Costa Rica, Cuba, Czechoslovakia, Denmark, Dominican Republic, Ecuador, Egypt, El Salvador, Ethiopia, France, Greece, Guatemala, Haiti, Honduras, India, Iran, Iraq, Lebanon, Liberia, Luxembourg, Mexico, Netherlands, New Zealand, Nicaragua, Norway, Panama, Paraguay, Peru, Philippine Republic, Poland, Saudi Arabia, Syria, Turkey, Ukrainian Soviet Socialist Republic, Union of South Africa, Union of Soviet Socialist Republics, United Kingdom, United States, Uruguay, Venezuela, Yugoslavia
Added: Afghanistan, Iceland, Siam, Sweden
Added: Pakistan, Yemen (the Yemen Arab Republic)
Added: Burma
Added: Indonesia
Added: Japan, Morocco, Sudan, Tunisia
Added: Ghana, Federation of Malaya
Added: Guinea
* On 22 February 1958, merged with (both original members of the United Nations) to become the United Arab Republic.
Added: Cameroun, Central African Republic, Chad, Congo (Brazzaville), Congo (Leopoldville), Cyprus, Dahomey, Gabon, Ivory Coast, , Mali, Niger, Nigeria, Senegal, Somalia, Togo, Upper Volta
Added: Mauritania, Mongolia, Sierra Leone, Tanganyika
*On 13 October 1961, Syria, having resumed its status as an independent State from the United Arab Republic, resumed its separate membership in the United Nations.
Added: Algeria, Burundi, Jamaica, Rwanda, Trinidad and Tobago, Uganda
Added: Kenya, Kuwait,
Added: Malawi, Malta, Zambia
*On 26 April 1964, Zanzibar merged with Tanganyika to become the United Republic of Tanzania.
Added: The Gambia, Maldive Islands, Singapore
*On 20 January 1965, temporarily withdrew from the United Nations.
Added: Barbados, Botswana, Guyana, Lesotho
* On 28 September 1966, rejoined the United Nations.
Added: Yemen (People's Democratic Republic of Yemen)
Added: Fiji
Added: Bahrain, Bhutan, Oman, Qatar, United Arab Emirates
Added: Bahamas, Federal Republic of Germany, German Democratic Republic
Added: Bangladesh, Grenada, Guinea-Bissau
Added: Cape Verde, Comoros, Mozambique, Papua New Guinea, Sao Tome and Principe, Suriname
Added: Angola, Samoa, Seychelles
Added: Djibouti, Viet Nam
Added: Dominica, Solomon Islands
Added: Saint Vincent and the Grenadines, Zimbabwe
Added: Antigua and Barbuda, Belize, Vanuatu
Added: Liechtenstein, Namibia
*On 22 May 1990, the People's Democratic Republic of Yemen (member since 1967) was united with the Yemen Arab Republic (member since 1947), forming the Republic of .
On 3 October 1990, the German Democratic Republic acceded to the Federal Republic of Germany (both members since 1973), resulting in the reunification of Germany.
Added: Democratic People's Republic of Korea, Estonia, Latvia, Lithuania, Marshall Islands, Federated States of Micronesia, Republic of Korea
Added: Armenia, Azerbaijan, Bosnia and Herzegovina, Croatia, Georgia, Kazakhstan, Kyrgyzstan, Republic of Moldova, San Marino, Slovenia, Tajikistan, Turkmenistan, Uzbekistan
Added: Andorra, Czech Republic, Eritrea, Monaco, Slovakia, The former Yugoslav Republic of Macedonia
*Czechoslovakia was an original Member of the United Nations from 24 October 1945. The Czech and Slovak Federal Republic ceased to exist on 31 December 1992. On 19 January 1993, the Czech Republic and the Slovak Republic were both admitted separately to United Nations membership.
Added: Palau
Added: Federal Republic of Yugoslavia, Tuvalu
*The Federal Republic of Yugoslavia was part of the Socialist Federal Republic of Yugoslavia, which was an original member of the United Nations and was removed from the official roster of UN members in 2000, following its dissolution.
Added: Switzerland, Timor-Leste
Added: Montenegro
Added: