| Thornton Township, IL (Township) |
| Thorntonville, TX (Town) |
| Thorntown, IN (Town) |
| Thornville, OH (Village) |
| Thorp, WI (City) |
| Thorp, SD (Township) |
| Thorp Town, WI (Town) |
| Thorpe, MN (Township) |
| Thorsby, AL (Town) |
| Thorson, ND (Township) |
| Thousand Oaks, CA (City) |
| Thousand Oaks Community Development District, FL (CDD) |
| Thrall, TX (Town) |
| Three Forks, MT (City) |
| Three Lakes, MN (Township) |
