| Code | Country | Continent | Population |
| TCD | Chad | Africa | 7,651,000 |
| TGO | Togo | Africa | 4,629,000 |
| THA | Thailand | Asia | 61,399,000 |
| TJK | Tajikistan | Asia | 6,188,000 |
| TKL | Tokelau | Oceania | 2,000 |
| TKM | Turkmenistan | Asia | 4,459,000 |
| TMP | East Timor | Asia | 885,000 |
| TON | Tonga | Oceania | 99,000 |
| TTO | Trinidad and Tobago | North America | 1,295,000 |
| TUN | Tunisia | Africa | 9,586,000 |
| TUR | Turkey | Asia | 66,591,000 |
| TUV | Tuvalu | Oceania | 12,000 |
| TWN | Taiwan | Asia | 22,256,000 |
| TZA | Tanzania | Africa | 33,517,000 |
| UGA | Uganda | Africa | 21,778,000 |
| UKR | Ukraine | Europe | 50,456,000 |
| URY | Uruguay | South America | 3,337,000 |
| USA | United States | North America | 278,357,000 |
| UZB | Uzbekistan | Asia | 24,318,000 |
| VAT | Holy See (Vatican City State) | Europe | 1,000 |