| Code | Name | Region |
|---|---|---|
| USOVJ | Thompsonville | NY |
| USTSJ | Thomson | GA |
| USTXN | Thomson | IL |
| USTOS | Thonotosassa | FL |
| USTHR | Thorndale | PA |
| USRN6 | Thorndale | TX |
| USKTB | Thorne Bay | AK |
| USTNN | Thornton | CA |
| USTHT | Thornton | CO |
| USTHQ | Thornton | IL |
| USTEO | Theodore | AL |
| USTQE | Theresa | NY |
| USTRE | Theresa | WI |
| USTRM | Thermal | CA |
| USTHP | Thermopolis | WY |
| USUUD | Thetford | VT |
| USTHI | Thibodaux | LA |
| USTVF | Thief River Falls | MN |
| USTSV | Thiensville | WI |
| USTXM | Thomas | OK |
| USTM2 | Thomas | WV |
| USTH9 | Thomasboro | IL |
| USTHO | Thomaston | CT |
| USTHS | Thomaston | GA |
| USTSK | Thomaston | ME |
| USTVM | Thomasville | AL |
| USTVI | Thomasville | GA |
| USTVE | Thomasville | NC |
| USTMV | Thomasville | PA |
| US3TH | Thompson | CT |
| USTXA | Texas | MD |
| USTXT | Texas City | TX |
| UST2X | Texhoma | OK |
| USTX5 | Texico | IL |
| USTHK | Thacker | WV |
| USQVL | Thackerville | OK |
| USZTH | Thatcher | AR |
| USYUZ | Thatcher | AZ |
| USTAY | Thayer | KS |
| USTXY | Thayer | MO |
| USTY8 | Thayne | WY |
| USCY2 | The Colony | TX |
| USDLS | The Dalles | OR |
| USTH7 | The Hills | TX |
| USTP9 | The Plains | VA |
| USRKG | The Rock | GA |
| USVGZ | The Villages | FL |
| USTHW | The Woodlands | TX |
| USTDF | Thedford | NE |
| USOJL | Thenard | CA |