- Topaz
- Tormey
- Tortuga
- Towle
- Town and Country Village
- Town Talk
- Toyanza Subdivision
- Toyon
- Trabuco Highlands
- Treasure Island
- Treasure Island
- Treasure Island
- Trent
- Trenton
- Tres Pinos
- Trevarno
- Trigo
- Trimmer
- Trinity Alps
- Trinity Center
- Trinity Village
- Trocha
- Trona
- Trowbridge
- Troy
- Truckhaven
- Trull
- Truth Home
- Tryon Corner
- Tubbs Island