| Code | Name | Continent | Region | Population |
| SVN | Slovenia | Europe | Southern Europe | 1,987,800 |
| SWE | Sweden | Europe | Nordic Countries | 8,861,400 |
| SWZ | Swaziland | Africa | Southern Africa | 1,008,000 |
| SYC | Seychelles | Africa | Eastern Africa | 77,000 |
| SYR | Syria | Asia | Middle East | 16,125,000 |
| TCA | Turks and Caicos Islands | North America | Caribbean | 17,000 |
| TCD | Chad | Africa | Central Africa | 7,651,000 |
| TGO | Togo | Africa | Western Africa | 4,629,000 |
| THA | Thailand | Asia | Southeast Asia | 61,399,000 |
| TJK | Tajikistan | Asia | Southern and Central Asia | 6,188,000 |
| TKL | Tokelau | Oceania | Polynesia | 2,000 |
| TKM | Turkmenistan | Asia | Southern and Central Asia | 4,459,000 |
| TMP | East Timor | Asia | Southeast Asia | 885,000 |
| TON | Tonga | Oceania | Polynesia | 99,000 |
| TTO | Trinidad and Tobago | North America | Caribbean | 1,295,000 |
| TUN | Tunisia | Africa | Northern Africa | 9,586,000 |
| TUR | Turkey | Asia | Middle East | 66,591,000 |
| TUV | Tuvalu | Oceania | Polynesia | 12,000 |
| TWN | Taiwan | Asia | Eastern Asia | 22,256,000 |
| TZA | Tanzania | Africa | Eastern Africa | 33,517,000 |