- Thibodeau Island
- Thief Island
- Thomas Great Toe
- Thomas Island
- Thomaston
- Thompson
- Thompson Corner
- Thompson Island
- Thompson Island
- Thorndike
- Thorne Island
- Thornton Heights
- Thorofare Island
- Thorotare Island
- Three Bush Island
- Three Islands
- Three Mile Island
- Three Pine Island
- Three Streams
- Thrumcap
- Thrumcap
- Thrumcap
- Thrumcap
- Thrumcap Island
- Thrumcap Island
- Thrumcap Island
- Thurstons Corner
- Tibbet Island
- Tibbett Island
- Tibbettstown