- Three Sisters Islands
- Three Sisters Islands
- Threemile Harbor
- Threemile Island
- Throgs Neck
- Throgs Neck Houses
- Throop
- Throopsville
- Thurman
- Thurms Mobile Homes
- Thurston
- Tiana
- Tick Island (historical)
- Ticonderoga
- Tidd Island
- Tillson
- Tilly Foster
- Timothy Heights
- Tinker Tavern Corner
- Tinkertown
- Tioga Center
- Tioga Terrace
- Tiona
- Tip Top
- Tiplady
- Titusville
- Tivoli
- Toad Harbor
- Toddsville
- Toddville