^ [#ref_A_1 Egypt and Syria merged to form the United Arab Republic on 22 February 1958. They resumed as separate UN members on 13 October 1961 after Syria resumed its status as an independent state.
^ abcd Tanganyika and Zanzibar merged to form the United Republic of Tanganyika and Zanzibar on 26 April 1964, which later changed its name to the United Republic of Tanzania.
^ abcd Indonesia temporarily withdrew from the UN on 20 January 1965. It announced its intention "to resume full cooperation with the United Nations and to resume participation in its activities" on 19 September 1966, and was invited to rejoin the UN on 28 September 1966.
^ abcd Yemen and Democratic Yemen merged on 22 May 1990.
^ abcd The German Democratic Republic acceded to the Federal Republic of Germany on 3 October 1990.
^ ab Czechoslovakia ceased to be a UN member on 1 January 1993 after its dissolution into the Czech Republic and Slovakia.
^ ab Yugoslavia (referring to the Socialist Federal Republic of Yugoslavia), effectively dissolved by 1992, was removed from the official roster of UN members in 2000 following the admission of Bosnia and Herzegovina, Croatia, Slovenia, Macedonia, and the Federal Republic of Yugoslavia (name later changed to Serbia and Montenegro) as new UN members.