| Country | Location |
| Tajikistan | Central Asia, west of China |
| Tanzania | Eastern Africa, bordering the Indian Ocean, between Kenya and Mozambique |
| Thailand | Southeastern Asia, bordering the Andaman Sea and the Gulf of Thailand, southeast of Burma |
| Timor-Leste | Southeastern Asia, northwest of Australia in the Lesser Sunda Islands at the eastern end of the Indonesian archipelago; note - Timor-Leste includes the eastern half of the island of Timor, the Oecussi (Ambeno) region on the northwest portion of the island of Timor, and the islands of Pulau Atauro and Pulau Jaco |
| Togo | Western Africa, bordering the Bight of Benin, between Benin and Ghana |
| Tokelau | Oceania, group of three atolls in the South Pacific Ocean, about one-half of the way from Hawaii to New Zealand |
| Tonga | Oceania, archipelago in the South Pacific Ocean, about two-thirds of the way from Hawaii to New Zealand |
| Trinidad and Tobago | Caribbean, islands between the Caribbean Sea and the North Atlantic Ocean, northeast of Venezuela |
| Tunisia | Northern Africa, bordering the Mediterranean Sea, between Algeria and Libya |
| Turkey | southeastern Europe and southwestern Asia (that portion of Turkey west of the Bosporus is geographically part of Europe), bordering the Black Sea, between Bulgaria and Georgia, and bordering the Aegean Sea and the Mediterranean Sea, between Greece and Syria |
| Turkmenistan | Central Asia, bordering the Caspian Sea, between Iran and Kazakhstan |
| Turks and Caicos Islands | Caribbean, two island groups in the North Atlantic Ocean, southeast of The Bahamas, north of Haiti |
| Tuvalu | Oceania, island group consisting of nine coral atolls in the South Pacific Ocean, about one-half of the way from Hawaii to Australia |
| Uganda | Eastern Africa, west of Kenya |
| Ukraine | Eastern Europe, bordering the Black Sea, between Poland, Romania, and Moldova in the west and Russia in the east |
| United Arab Emirates | Middle East, bordering the Gulf of Oman and the Persian Gulf, between Oman and Saudi Arabia |
| United Kingdom | Western Europe, islands including the northern one-sixth of the island of Ireland between the North Atlantic Ocean and the North Sea, northwest of France |
| United States | North America, bordering both the North Atlantic Ocean and the North Pacific Ocean, between Canada and Mexico |