South Vietnam — Vietnam
South-West Africa — Namibia
South Yemen (People's Democratic — Yemen Republic of Yemen)
Soviet Union [the former] — Armenia, Azerbaijan, Belarus, — Estonia,
Georgia, Kazakhstan, — Kyrgyzstan, Latvia, Lithuania, — Moldova,
Russia, Tajikistan, — Turkmenistan, Ukraine, Uzbekistan
Spanish Guinea — Equatorial Guinea
Spanish Sahara — Western Sahara
Spitsbergen — Svalbard
Stanley — Falkland Islands (Islas Malvinas)
Stockholm [US Embassy] — Sweden
Strasbourg [US Consulate General] — France