77 selected
- Not filled in
- Saarland - German Republic State (1947-1957)
- Sahrawi Arab Democratic Republic (SADR) (1990 - present)
- Saint Helena - British Colony (1834-1981)
- Saint Helena and Ascension - British Overseas territory (1981-heden)
- Saint Lucia - British Associated State (1967-1979)
- Saint Lucia - Constitutional Monarchy (1979-present)
- Saint Pierre and Miquelon - French Territory (1814-1958)
- Saint Vincent - British Associated State (1969-1979)
- Saint Vincent - Constitutional Monarchy (1979-present)
- Saint-Kitts & Nevis - Brits Rijk – autonoom gebied (1967-1983)
- Saint-Kitts & Nevis - monarchie (1983-heden)
- Samoa - Republic (1962-heden)
- San Marino - Republic (301-present)
- São Tomé and Príncipe - Democratic Republic (1975-heden)
- Sao Tomé en Principe - Portugese colony (1493-1975)
- Sarawak - British Protectorate (1841-1946)
- Sasanian Empire 224-651
- Saudi Arabia - Kingdom (1932-heden)
- Scotland - Kingdom (1058-1707)
- Senegal - Republic (1960-present)
- Serbia - German Occupation
- Serbia - Kingdom (1878-1918)
- Serbia - Republic (2006-heden)
- Serbia - State Union of Serbia and Montenegro (2003-2006)
- Seychelles - British Colony (1903-1976)
- Seychelles - Republic (1976-heden)
- Sharjah - Emirate (1727-1971)
- Sierra Leone - Republic (1961-heden)
- Silesia - part of kingdom Bohemia (1335-1918)
- Singapore - Republic (1965-heden)
- Slovakia - Republic (1939-1945)
- Slovakia - Republic (1993-present)
- Slovenia - Republic (1991-present)
- Solomon Islands - Commonwealth Nation (1976-heden)
- Somali - Democratic Republic (1969-1991)
- Somali - Transitional Federal Government (2004-2012)
- Somali - Transitional National Government (2000-2004)
- Somalia - Federal Government (2012-today)
- Somalia - Republic (1960-1969)
- Somalië - Civil war (1991-2000)
- Somalië - United Nations Trust Territory (1949-1960)
- Somaliland - Republic (1991-present)
- South Africa - Republic (1961-present)
- South Africa - South African Republic (1857-1902)
- South Africa - Union (1910-1961)
- South Arabia
- South Georgia and the South Sandwich Islands - British Territory (1775-present)
- South Korea - Republic (1948-present)
- South Sudan - Federal Presidential Democratic Republic (2011-present)
- South Vietnam - Democratic State (1949-1975)
- Southern Rhodesia - British Colony (1923-1953)
- Sovereign Military Order of Malta (Order of Malta)
- Spain - Civil War (1936-1939)
- Spain - Francoist Spain (1939-1975)
- Spain - Kingdom (1504-1931)
- Spain - Kingdom (1975-present)
- Spain - Provisional Government (1868-1871)
- Spain - Second Republic (1931-1939)
- Spain - Spanish-Arab Period (711-1492)
- Spitzbergen - Norwegian Territory (1920-heden)
- Sri Lanka - Democratic Socialist Republic (1972-present)
- Stoltenhoff Island - british sea area
- Straits Settlements - British Colony (1867-1939)
- Straits Settlements - British India government (1858-1867)
- Straits Settlements - East India Company (1826-1858)
- Sudan - Republic (1956-present)
- Suriname - Colonie of the Netherlands (1492-1954)
- Suriname - Constituent country of the Netherlands (1954-1975)
- Suriname - Republic (1975-present)
- Swaziland - Kingdom (1968-present)
- Sweden - Kingdom (1523-present)
- Switzerland - Cantons (tot 1848)
- Switzerland - Confederation (1848-present)
- Syria - French mandate (1920-1946)
- Syria - Syrian Arab Republic (1962-present)
- Syria - United Arab Republic (1958–1961)
- Syrië - Republiek (1946-1958)