| Code | Name | Region |
|---|---|---|
| USUGI | Uganik | AK |
| USUGS | Ugashik | AK |
| USUHV | Uhrichsville | OH |
| USUKI | Ukiah | CA |
| US4TP | Ulm | AR |
| USUDM | Ulm | MT |
| USUER | Ulmer | SC |
| USUL5 | Ulster Park | NY |
| US3DV | Ulupalakua | HI |
| USUSY | Ulysses | KS |
| USUZS | Ulysses | NE |
| USTWF | Twin Falls | ID |
| USTWA | Twin Hills | AK |
| USTW2 | Twin Lake | MI |
| USTVV | Twin Lakes | WI |
| US8WN | Twin Mountain | NH |
| US2RK | Twin Rocks | PA |
| USTBG | Twinsburg | OH |
| USTWI | Twisp | WA |
| USTHB | Two Harbors | MN |
| USTWR | Two Rivers | WI |
| USTYA | Ty Ty | GA |
| USZYI | Tybee Island | GA |
| USTQY | Tye | TX |
| USTE8 | Tyee | AK |
| USTYL | Tyler | AL |
| USTLX | Tyler | MN |
| USTYR | Tyler | TX |
| USTP8 | Tylersport | PA |
| USTTQ | Tylertown | MS |
| USTJF | Tyndall Afb | FL |
| USTL6 | Turtle Lake | ND |
| USTTK | Turtle Lake | WI |
| UST2N | Tusayan | AZ |
| USTCL | Tuscaloosa | AL |
| USTS8 | Tuscan | MS |
| USTT9 | Tuscan | NY |
| USTU2 | Tuscarora | NV |
| USTZC | Tuscarora | PA |
| USXNH | Tuscola | IL |
| USTSC | Tuscumbia | AL |
| USTGE | Tuskegee | AL |
| USTUN | Tustin | CA |
| USTT8 | Tuttle | OK |
| USTUT | Tutwiler | MS |
| USTXD | Tuxedo | MD |
| USXND | Tuxedo Park | NY |
| USWNC | Tuxekan Island | AK |
| USTW3 | Twelve Mile | IN |
| USTNP | Twentynine Palms | CA |