- Taft
- Taft Heights
- Taft Mosswood
- Tahoe Donner
- Tahoe Vista
- Tahoma
- Talmage
- Tamalpais Valley
- Tamalpais-Homestead Valley
- Tara Hills
- Tarpey Village
- Taylorsville
- Tecopa
- Tehachapi
- Tehama
- Temecula
- Temelec
- Temple City
- Templeton
- Tennant
- Terminous
- Terra Bella
- Teviston
- The Sea Ranch
- Thermal
- Thermalito
- Thornton
- Thousand Oaks
- Thousand Palms
- Three Rivers
- Three Rocks
- Tierra Buena
- Tipton
- Tobin
- Tomales
- Tonyville
- Tooleville
- Topanga
- Topaz
- Toro Canyon
- Torrance
- Trabuco Canyon
- Tracy
- Tranquillity
- Traver
- Tres Pinos
- Trinidad
- Trinity Center
- Trinity Village
- Trowbridge
- Truckee
- Tujunga
- Tulare
- Tulelake
- Tuolumne City
- Tupman
- Turlock
- Tustin
- Tuttle
- Tuttletown
- Twain
- Twain Harte
- Twentynine Palms
- Twin Lakes
