Saint Vincent and the Grenadines
27 October 1979 (from UK)
Samoa
1 January 1962 (from New Zealand-administered UN trusteeship)
San Marino
3 September AD 301
Sao Tome and Principe
12 July 1975 (from Portugal)
Saudi Arabia
23 September 1932 (unification of the kingdom)
Senegal
4 April 1960 (from France); note - complete independence
achieved upon dissolution of federation with Mali on 20 August 1960
Serbia
5 June 2006 (from Serbia and Montenegro)
Seychelles
29 June 1976 (from UK)
Sierra Leone
27 April 1961 (from UK)
Singapore
9 August 1965 (from Malaysian Federation)