| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Trabuco Canyon | city | California | United States | 33.66 | -117.59 | 1072 | |
| Trabuco Highlands | city | California | United States | 33.61 | -117.57 | 954 | |
| Tracy | city | California | United States | 37.74 | -121.43 | 52 | |
| Tradewinds Mobile Home Park | city | California | United States | 36.97 | -121.96 | 0 | |
| Tradewinds Trailer Village | city | California | United States | 33.65 | -117.92 | 13 | |
| Tragedy Spring (historical) | city | California | United States | 38.64 | -120.14 | 7801 | |
| Trailer Haven | city | California | United States | 36.96 | -121.97 | 39 | |
| Trailer Rancho Mobile Home Park | city | California | United States | 37.49 | -122.19 | 45 | |
| Trailer Tel Mobile Home Park | city | California | United States | 37.37 | -121.89 | 75 | |
| Trailer Villa Mobile Home Park | city | California | United States | 37.49 | -122.19 | 45 | |
| Trails End Mobile Home Park | city | California | United States | 38.58 | -121.54 | 13 | |
| Trancas | city | California | United States | 34.03 | -118.84 | 68 | |
| Tranquillity | city | California | United States | 36.65 | -120.25 | 164 | |
| Travelodge Mobile Home Park | city | California | United States | 37.40 | -122.08 | 95 | |
| Travelodge Mobile Home Park | city | California | United States | 37.37 | -121.89 | 68 | |
| Traver | city | California | United States | 36.46 | -119.48 | 259 | |
| Travis Field | city | California | United States | 38.27 | -121.93 | 59 | |
| Treasure Island Mobile Home Park | city | California | United States | 33.52 | -117.76 | 0 | |
| Treasure Island Mobile Home Park | city | California | United States | 37.67 | -122.45 | 196 | |
| Tree Mobile Home Park | city | California | United States | 33.86 | -117.96 | 144 | |
| Trent | city | California | United States | 37.08 | -120.88 | 121 | |
| Trenton | city | California | United States | 38.49 | -122.85 | 78 | |
| Tres Pinos | city | California | United States | 36.79 | -121.32 | 830 | |
| Trescape (historical) | city | California | United States | 35.14 | -118.08 | 2614 | |
| Trestle Glen | city | California | United States | 37.81 | -122.23 | 193 | |
| Trevarno | city | California | United States | 37.69 | -121.75 | 830 | |
| Treves (historical) | city | California | United States | 35.33 | -118.79 | 830 | |
| Triangle Court | city | California | United States | 37.95 | -122.36 | 45 | |
| Trico Mobile Estates | city | California | United States | 33.23 | -117.33 | 196 | |
| Trigo | city | California | United States | 36.91 | -119.96 | 265 | |
| Trigo (historical) | city | California | United States | 37.89 | -120.97 | 131 | |
| Trimmer | city | California | United States | 36.90 | -119.30 | 1171 | |
| Trinidad | city | California | United States | 41.06 | -124.14 | 0 | |
| Trinity Alps | city | California | United States | 40.86 | -122.89 | 2598 | |
| Trinity Center | city | California | United States | 40.98 | -122.70 | 2509 | |
| Trinity Village | city | California | United States | 40.88 | -123.53 | 830 | |
| Triunfo Corner | city | California | United States | 34.16 | -118.82 | 997 | |
| Trocha | city | California | United States | 35.80 | -119.15 | 830 | |
| Trona | city | California | United States | 35.76 | -117.37 | 1669 | |
| Trousdale Estates | city | California | United States | 34.11 | -118.40 | 1174 | |
| Trowbridge | city | California | United States | 38.91 | -121.53 | 39 | |
| Troy | city | California | United States | 39.31 | -120.46 | 6709 | |
| Truckee | city | California | United States | 39.33 | -120.18 | 6033 | |
| Truckhaven | city | California | United States | 33.30 | -115.98 | -1689 | |
| Trull | city | California | United States | 37.94 | -121.50 | -1689 | |
| Truth Home | city | California | United States | 38.58 | -123.14 | 1040 | |
| Tryon Corner | city | California | United States | 41.88 | -124.15 | 164 |