| Code | Name | Continent | Region |
| SVN | Slovenia | Europe | Southern Europe |
| SWE | Sweden | Europe | Nordic Countries |
| SWZ | Swaziland | Africa | Southern Africa |
| SYC | Seychelles | Africa | Eastern Africa |
| SYR | Syria | Asia | Middle East |
| TCA | Turks and Caicos Islands | North America | Caribbean |
| TCD | Chad | Africa | Central Africa |
| TGO | Togo | Africa | Western Africa |
| THA | Thailand | Asia | Southeast Asia |
| TJK | Tajikistan | Asia | Southern and Central Asia |
| TKL | Tokelau | Oceania | Polynesia |
| TKM | Turkmenistan | Asia | Southern and Central Asia |
| TMP | East Timor | Asia | Southeast Asia |
| TON | Tonga | Oceania | Polynesia |
| TTO | Trinidad and Tobago | North America | Caribbean |
| TUN | Tunisia | Africa | Northern Africa |
| TUR | Turkey | Asia | Middle East |
| TUV | Tuvalu | Oceania | Polynesia |
| TWN | Taiwan | Asia | Eastern Asia |
| TZA | Tanzania | Africa | Eastern Africa |