| Code | Name | Region |
|---|---|---|
| USTOX | Tremont | PA |
| USTRT | Tremonton | UT |
| UST2R | Trempealeau | WI |
| USTZE | Trent | SD |
| USTNR | Trenton | CA |
| USTOE | Trenton | FL |
| USZJO | Trenton | GA |
| USTEQ | Trenton | IL |
| USTXE | Trenton | KY |
| USYTR | Trenton | LA |
| USTO7 | Tower Lakes | IL |
| USTC4 | Town And Country | MO |
| USTC2 | Town Creek | AL |
| USTXW | Townsend | DE |
| USTQW | Townsend | GA |
| USTWB | Townsend | MA |
| USTSD | Townshend | VT |
| USWP2 | Township Of Woolwich | NJ |
| USTWS | Towson | MD |
| USTC9 | Trabuco Canyon | CA |
| USTRC | Tracy | CA |
| USTY2 | Tracy | MN |
| USTR3 | Tracys Landing | MD |
| USTFG | Trafalgar | IN |
| US7TR | Trafford | AL |
| USTFF | Trafford | PA |
| USTRA | Trainer | PA |
| USTFR | Transfer | PA |
| USTZ4 | Trappe | MD |
| USTP4 | Trappe | PA |
| USQ5V | Toquerville | UT |
| USQTN | Tornillo | TX |
| US3TT | Toronto | KS |
| USTOD | Toronto | OH |
| USTOA | Torrance | CA |
| USQRR | Torreon | NM |
| USTR2 | Torrey | UT |
| USTGT | Torrington | CT |
| USTOR | Torrington | WY |
| USTOT | Totowa | NJ |
| USTTV | Tottenville, Staten Island | NY |
| USTH8 | Touchet | WA |
| USZTU | Toughkenamon | PA |
| USTU9 | Toulon | IL |
| UST5W | Tow | TX |
| USTWJ | Towaco | NJ |
| USTWK | Towanda | KS |
| USTOW | Towanda | PA |
| USTW8 | Tower | MN |
| USTWC | Tower City | PA |