- Thomas Mountain
- Thomas Place
- Thompson
- Thompson Place
- Thorn Junction
- Thornton
- Thousand Oaks
- Thousand Palms
- Three Brothers
- Three Crossing
- Three Points
- Three Points
- Three Rivers
- Three Rocks
- Three Rocks
- Three Sisters
- Thunderbird Ranches
- Thyle
- Tiber
- Tiburón
- Tiburon
- Tierra Buena
- Tierra del Sol
- Tillas Island
- Timba
- Timber Trails
- Timberland
- Timbuctoo
- Tin City
- Tinsley Island