- Thornbury Hunt
- Thornbury Knoll
- Thorndale
- Thorndale
- Thornhurst
- Thornridge
- Thornton
- Thornton Junction
- Thornwood
- Three Mile Island
- Three Springs
- Three Springs Run
- Three Tuns
- Threemile
- Throop
- Thumptown
- Tiadaghton
- Tiberton
- Tidal
- Tide
- Tidioute
- Tidioute Island
- Tiffany
- Tifllie
- Tillotson
- Timber Hills
- Timber Ridge
- Timberly Heights
- Timblin
- Timbuck