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| Name | Entry in The World Factbook | |
| Siam | Thailand | |
| Sibutu Passage | Pacific Ocean | |
| Sicily | Italy | |
| Sicily, Strait of | Atlantic Ocean | |
| Sikkim | India | |
| Sinai | Egypt | |
| Singapore [US Embassy] | Singapore | |
| Singapore Strait of | Atlantic Ocean | |
| Sinkiang (Xinjiang) | China | |
| Sint Eustatius | Netherlands Antilles | |
| Sint Maarten (St. Martin) | Netherlands Antilles | |
| Skagerrak | Atlantic Ocean | |
| Slovakia | Czechoslovakia | |
| Society Islands (Îles de la Société) | French Polynesia | |
| Socotra | Yemen, People's Democratic Republic of | |
| Sofia [US Embassy] | Bulgaria | |
| Solomon Islands, northern | Paupa New Guinea | |
| Solomon Islands, southern | Solomon Islands | |
| Soloman Sea | Pacific Ocean | |
| Songkhla [US Consulate] | Thailand | |
| Sound, The (Øresund) | Atlantic Ocean | |
| South Atlantic Ocean | Atlantic Ocean | |
| South China Sea | Pacific Ocean | |
| Southern Grenadines | Grenada | |
| Southern Rhodesia | Zimbabwae | |
| South Georgia | South Georgia and the South Sandwich Islands | |
| South Island | New Zeland | |
| South Korea | Korea, South | |
| South Orkney Islands | Antarctica | |
| South Pacific Ocean | Pacific Ocean | |
| South Sandwich Islands | South Georgia and South Sandwich Islands | |
| South Shetland Islands | Antarctica | |
| South Tyrol | Italy | |
| South Vietnam | Vietnam | |
| South-West Africa | Nambia | |
| South Yemen | Yemen, People's Democratic Republic of | |
| Spanish Guinea | Equitorial Guinea | |
| Spanish Sahara | Western Sahara | |
| Spitsbergen | Svalbard | |
| Stockholm [US Embassy] | Sweden | |
| Strasbourg [US Consulate General] | France | |
| Stuttgart [US Consulate General] | Federal Republic of Germany | |
| Suez, Gulf of | Indian Ocean | |
| Sulu Archipelago | Philippines | |
| Sulu Sea | Pacfic Ocean | |
| Sumatra | Indonesia | |
| Sumba | Indonesia | |
| Sunda Islands (Soenda Isles) | Indonesia; Malyasia | |
| Sunda Strait | Indian Ocean | |
| Surabaya [US Consulate] | Indonesia | |
| Surigao Strait | Pacific Ocean | |
| Surinam | Suriname | |
| Suva [US Embassy] | Fiji | |
| Swains Island | American Somoa | |
| Swan Islands | Honduras | |
| Sydney [US Consulate General] | Australia | |
| T | Tahiti | French Polynesia |
| Taipei | Taiwan | |
| Taiwan Strait | Pacific Ocean | |
| Tampico [US Consular Agency] | Mexico | |
| Tanganyika | Tanzania | |
| Tangier [US Consulate General] | Morocco |
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