| Three Forks, MT (City) |
| Three Lakes, MN (Township) |
| Three Lakes Town, WI (Town) |
| Three Oaks, MI (Village) |
| Three Oaks Township, MI (Township) |
| Three Rivers, MI (City) |
| Three Rivers, SD (Township) |
| Three Rivers, TX (City) |
| Three Springs, PA (Borough) |
| Three Way, TN (City) |
| Throckmorton, TX (City) |
| Throckmorton County, TX (County) |
| Throop, NY (Town) |
| Throop, PA (Borough) |
| Thunder Lake, MN (Township) |
