| Triple Creek Community Development District, FL (CDD) |
| Triplett, MO (City) |
| Triplett, MO (Township) |
| Tripoli, IA (City) |
| Tripp, SD (City) |
| Tripp County, SD (County) |
| Tripp Town, WI (Town) |
| Triumph, ND (Township) |
| Triumph, NE (Township) |
| Triumph Township, PA (Township) |
| Trivoli, KS (Township) |
| Trivoli Township, IL (Township) |
| Trommald, MN (City) |
| Trondhjem, MN (Township) |
| Trophy Club, TX (Town) |
