- The Twins
- Thera
- Thiel
- Thomas
- Thomas
- Thomas Place Mobile Home Park
- Thompson Place
- Thornton
- Thornwood
- Thrall
- Thrashers Corner
- Three Ponds Mobile Home Park
- Three Rivers Mobile Home Park
- Thrift
- Thunderbird Mobile Home Park
- Tietonview Grange
- Tiflis
- Tift Rocks
- Tiger
- Tiger Mountain Mobile Home Park
- Tillicum
- Timberland Village Mobile Home Park
- Timberlane
- Timberline Mobile Home Park
- Timberline Mobile Home Village
- Timentwa
- Tire Junction
- Titlow
- Tivoli Island
- Tokio