| Code | Name | Region |
|---|---|---|
| USTBL | Trumbull | CT |
| USUUL | Trumbull | NE |
| USTXO | Truro | MA |
| USTRU | Trussville | AL |
| USTCS | Truth Or Consequences | NM |
| USZNT | Tryon | NC |
| USTWL | Tualatin | OR |
| USTBC | Tuba City | AZ |
| USTBZ | Tubac | AZ |
| USXTY | Tuckahoe | NY |
| USZSQ | Tucker | AR |
| USTRZ | Troutman | NC |
| USUZG | Troutville | VA |
| USTOI | Troy | AL |
| USTOJ | Troy | ID |
| USTGY | Troy | IL |
| USOYY | Troy | IN |
| UST77 | Troy | KS |
| USTOY | Troy | ME |
| USTYM | Troy | MI |
| USTYU | Troy | MO |
| USTYI | Troy | MS |
| USTM8 | Troy | MT |
| USTYX | Troy | NC |
| UST6Y | Troy | NH |
| USTRY | Troy | NY |
| USTYH | Troy | OH |
| USYTY | Troy | PA |
| USTTY | Troy | TN |
| USTQZ | Troy | TX |
| USTYO | Troy | VA |
| USII9 | Trilla | IL |
| USAK4 | Trinidad | CA |
| USTAD | Trinidad | CO |
| US9TD | Trinidad | TX |
| USQTI | Trinity | AL |
| USTT7 | Trinity | MS |
| USTIR | Trinity | NC |
| USINZ | Trinity | TX |
| USTYK | Trinity Park | NC |
| USTNG | Trion | GA |
| USTIP | Tripp | SD |
| USTRH | Trona | CA |
| USTR7 | Trophy Club | TX |
| USTRO | Trotwood | OH |
| USTXP | Troup | TX |
| USTZQ | Trout Creek | MT |
| USTCR | Trout Creek | NY |
| USTQU | Trout Lake | WA |
| USTRR | Trout River | NY |