| Saarland |
| Sabah |
| Sachin |
| Saint Helena |
| Saint Kitts and Nevis |
| Saint Lucia |
| Saint Pierre and Miquelon |
| Saint Vincent and the Grenadines |
| Samoa (Western) |
| Samoa (American) |
| Samos |
| San Domingo |
| Sankt Gallen |
| Santa Catarina |
| Santa Fe |
| São Paulo |
| São Tomé and Príncipe |
| Sarawak |
| Sardinia |
| Saskatchewan |
| Saudi Arabia |
| Savantwadi |
| Saxe-Altenburg |
| Saxe-Coburg-Gotha |
| Saxony |
| Saxony, Lower |
| Saxony-Anhalt |
| Schaffhausen |
| Schaumburg-Lippe |
| Schleswig-Holstein |
| Schwyz |
| Scotland |
| Selangor |
| Senegal |
| Septinsular Republic |
| Sergipe |
| Serbia (till 1918) |
| Serbia and Montenegro |
| Serbia (since 2006) |
| Seven Provinces |
| Seychelles |
| Shandong |
| Sharjah |
| Shihr and Mukalla |
| SHS (Kingdom of Serbs, Croats & Slovenes) |
| Siak Sri Indrapura |
| Siam |
| Siberia |
| Sierra Leone |
| Singapore |
| Sint Maarten |
| Slovakia (1939) |
| Slovakia |
| Slovenia |
| Solomon Islands |
| Somalia |
| Somaliland |
| South Africa |
| South Arabia |
| South Australia |
| South Carolina |
| South Korea |
| South Lebanon |
| South Moluccas |
| South Peru |
| South Slavic State |
| South Sumatra |
| South-West Caucasus |
| South Vietnam |
| South Yemen |
| Southern Russia |
| Soviet Union (1923-1991) |
| Spain |
| Sri Lanka |
| Straits Settlements |
| Sudan |
| Suez Canal |
| Sulu |
| Sumatera Selatan |
| Sumatera Timur |
| Suriname |
| Suvadive |
| Sweden |
| Swedish East India Co. |
| Switzerland |
| Syria |