| Code | Name | Region |
|---|---|---|
| USTP7 | Tipton | KS |
| USTP5 | Tipton | MO |
| USTTP | Tipton | PA |
| USTPV | Tiptonville | TN |
| USTY3 | Tisbury | MA |
| USTHJ | Tishomingo | MS |
| USTSI | Tishomingo | OK |
| USTKW | Tiskilwa | IL |
| USTIX | Titusville | FL |
| USTIT | Titusville | PA |
| USTD8 | Tilden | TX |
| USTLM | Tillamook | OR |
| USZTR | Tillar | AR |
| USIAT | Tillatoba | MS |
| USTIQ | Tillery | NC |
| USTL8 | Tillson | NY |
| USTT3 | Tilton | IL |
| USTL2 | Tilton | NH |
| USIVC | Tiltonsville | OH |
| USTL3 | Timber Lake | SD |
| USTLE | Timberlake | NC |
| USTMB | Timberville | VA |
| USXTE | Timmonsville | SC |
| USTIM | Timnath | CO |
| USTUM | Timonium | MD |
| USTT5 | Timpson | TX |
| USTNC | Tin City | AK |
| USYTB | Tinker Air Force Base | OK |
| USTNL | Tinley Park | IL |
| USTIN | Tinton Falls | NJ |
| USXTV | Three Rivers | TX |
| UST3W | Three Way | TN |
| USTH6 | Throckmorton | TX |
| USTPY | Throop | PA |
| USTH4 | Thurmond | NC |
| USURM | Thurmont | MD |
| USTQS | Thurston | NE |
| USXTN | Tiburon | CA |
| USTIC | Ticonderoga | NY |
| USTDE | Tierra Verde | FL |
| US3TF | Tiffin | IA |
| USTFN | Tiffin | OH |
| USTMA | Tifton | GA |
| USTID | Tigard | OR |
| USTG9 | Tiger | GA |
| USTGR | Tigerton | WI |
| USTGL | Tignall | GA |
| USTIJ | Tijeras | NM |
| USKTH | Tikchik | AK |
| UST4D | Tilden | NE |