- Trevarno
- Treasure Island
- Toadtown
- Tamarack
- Tamarack Springs
- Telegraph City
- The Shores of Poker Flat
- Timber Trails
- Toyanza Subdivision
- Toyon
- Tillas Island
- Tryon Corner
- Tahoe City
- Tajiguas
- Tamalpais Valley
- Tarzana
- Terminous
- Termo
- Terra Linda
- Thermal
- Thornton
- Tionesta
- Tollhouse
- Toms Place
- Top of the World
- Topanga
- Trabuco Highlands
- Tres Pinos
- Trimmer
- Trinity Center