Samoa
Independence Day Celebration, 1 June (1962); note - 1 January
1962 is the date of independence from the New Zealand-administered
UN trusteeship, however it is observed in June
San Marino
Founding of the Republic, 3 September (AD 301)
Sao Tome and Principe
Independence Day, 12 July (1975)
Saudi Arabia
Unification of the Kingdom, 23 September (1932)
Senegal
Independence Day, 4 April (1960)
Serbia
National Day, 15 February
Seychelles
Constitution Day (National Day), 18 June (1993)
Sierra Leone
Independence Day, 27 April (1961)
Singapore
National Day, 9 August (1965)
Slovakia
Constitution Day, 1 September (1992)