| Code | Name | Region |
|---|---|---|
| USTH5 | Thornton | NH |
| USTWV | Thornton | WV |
| USTVH | Thornville | OH |
| USNYT | Thornwood | NY |
| USTRF | Thorofare | NJ |
| USTP6 | Thorp | CO |
| USTJP | Thorp | WA |
| USTQP | Thorp | WI |
| USTB2 | Thorsby | AL |
| USJTO | Thousand Oaks | CA |
| USUNG | Thousand Palms | CA |
| USTH2 | Thrall | TX |
| USTHE | Three Bridges | NJ |
| USTFK | Three Forks | MT |
| USQTF | Three Forks Junction | MT |
| USQTK | Three Lakes | WI |
| USOI7 | Three Oaks | MI |
| USTR8 | Three Rivers | CA |
| USTRJ | Three Rivers | MA |
| USHAI | Three Rivers | MI |
| USTPF | Thompson | IA |
| USTO5 | Thompson | MO |
| USTPJ | Thompson | ND |
| USTPS | Thompson | OH |
| USTHF | Thompson Falls | MT |
| USTHM | Thompsonfield | MO |
| UST9H | Thompsons | TX |
| USTVT | Thompsons Station | TN |
| USTPW | Thompsontown | PA |
| USTHL | Thompsonville | MI |
| 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 |