- Tukwila
- Tulalip
- Tulalip Bay
- Tulare Beach
- Tulips
- Tulker
- Tumtum
- Tumwater
- Tunnel Island
- Turk
- Turn Island
- Turner
- Turner Corner
- Tweedie
- Twin
- Twin Cedar Mobile Park
- Twin Cedars Mobile Home Park
- Twin Creek Mobile Home Park
- Twin Firs Mobile Home Park
- Twin Flags Mobile Home Community
- Twin Peaks Manor Mobile Home Park
- Twin Rocks
- Twin Spits
- Twisp
- Two Rivers
- Two Rivers Islands
- Tyee
- Tyee Beach
- Tyee Valley Mobile Manor
- Tyler