- Twin Lakes Village
- Tyrone
- Tennanah Lake
- Tusten
- Tylertown
- Tioga Center
- Tioga Terrace
- Tuffs Island
- Taughannock Falls
- Terpening Corners
- Trumbull Corners
- Tabasco
- Tall Oaks Mobile Home Park
- The Cape
- The Vly
- Thober Mobile Home Park
- Trinka's Mobile Home Park
- Trout Brook Mobile Home Park
- Tuckers Corner
- Turnwood
- Tuthill
- Tuthilltown
- Tea Island
- Temple Island
- Three Brothers Islands
- Three Sirens Island
- Thurman
- Triplet Islands
- Turtle Island
- The Plains