Saint Kitts and Nevis
19 September 1983 (from the UK)
Saint Lucia
22 February 1979 (from the UK)
Saint Martin
none (overseas collectivity of France)
Saint Pierre and Miquelon none (territorial collectivity of France; has been under French control since 1763)
Saint Vincent and the Grenadines
27 October 1979 (from the UK)
Samoa
1 January 1962 (from New Zealand-administered UN trusteeship)
San Marino
3 September 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