| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sea Aire Mobile Home Park | city | California | United States | 33.06 | -117.30 | 49 | |
| Sea Aria East Mobile Home Estates | city | California | United States | 33.72 | -118.02 | 16 | |
| Sea Aria West Mobile Home Estates | city | California | United States | 33.72 | -118.02 | 9 | |
| Sea Breeze Trailer Park | city | California | United States | 33.72 | -118.04 | 6 | |
| Sea Cliff | city | California | United States | 34.34 | -119.42 | 0 | |
| Sea Ranch | city | California | United States | 38.72 | -123.45 | 0 | |
| Seabright | city | California | United States | 36.97 | -122.01 | 0 | |
| Seacliff | city | California | United States | 37.79 | -122.49 | 141 | |
| Seacliff | city | California | United States | 36.97 | -121.92 | 0 | |
| Seacliffe Mobile Home Park | city | California | United States | 33.63 | -117.93 | 75 | |
| Seahaven | city | California | United States | 38.11 | -122.87 | 167 | |
| Seal Beach | city | California | United States | 33.74 | -118.10 | 0 | |
| Seal Beach Trailer Park | city | California | United States | 33.75 | -118.11 | 3 | |
| Seal Cove | city | California | United States | 37.52 | -122.51 | 0 | |
| Searles | city | California | United States | 35.48 | -117.64 | 3349 | |
| Searles Valley | city | California | United States | 35.77 | -117.40 | 1811 | |
| Sears Point | city | California | United States | 38.15 | -122.45 | 59 | |
| Searsville (historical) | city | California | United States | 37.40 | -122.25 | 396 | |
| Seaside | city | California | United States | 36.61 | -121.84 | 131 | |
| Seaview | city | California | United States | 38.55 | -123.23 | 1669 | |
| Sebastopol | city | California | United States | 38.40 | -122.82 | 150 | |
| Sebastopol | city | California | United States | 39.36 | -121.12 | 1978 | |
| Second Garrotte | city | California | United States | 37.82 | -120.20 | 3349 | |
| Secret Canyon (historical) | city | California | United States | 39.19 | -120.59 | 5285 | |
| Secret Town | city | California | United States | 39.16 | -120.88 | 3349 | |
| Sedco Hills | city | California | United States | 33.64 | -117.29 | 1669 | |
| Seeley | city | California | United States | 32.79 | -115.69 | -1689 | |
| Seguro | city | California | United States | 35.42 | -119.02 | 830 | |
| Seiad Valley | city | California | United States | 41.84 | -123.19 | 1669 | |
| Seigler Springs | city | California | United States | 38.87 | -122.69 | 2509 | |
| Selby | city | California | United States | 38.06 | -122.24 | 209 | |
| Selma | city | California | United States | 36.57 | -119.61 | 298 | |
| Selwyn (historical) | city | California | United States | 32.86 | -117.19 | 291 | |
| Seminary Park | city | California | United States | 37.77 | -122.19 | 180 | |
| Seminole Hot Springs | city | California | United States | 34.11 | -118.79 | 1131 | |
| Seminole Springs Trailer Park | city | California | United States | 34.11 | -118.79 | 1131 | |
| Semitropic | city | California | United States | 35.60 | -119.51 | 246 | |
| Seneca | city | California | United States | 40.11 | -121.08 | 4189 | |
| Sentinel (historical) | city | California | United States | 36.96 | -119.49 | 984 | |
| Sentous | city | California | United States | 34.03 | -118.37 | 95 | |
| Sepulveda | city | California | United States | 34.16 | -118.28 | 830 | |
| Sequoia | city | California | United States | 37.81 | -119.90 | 5029 | |
| Sequoia | city | California | United States | 36.43 | -119.12 | 830 | |
| Sequoia Mobile Home Park | city | California | United States | 37.48 | -122.20 | 49 | |
| Serena | city | California | United States | 34.41 | -119.56 | 0 | |
| Serena Park | city | California | United States | 34.42 | -119.57 | 0 | |
| Serra Mesa | city | California | United States | 32.80 | -117.14 | 374 | |
| Serra Village | city | California | United States | 36.60 | -121.70 | 311 | |
| Serrano | city | California | United States | 35.33 | -120.65 | 830 | |
| Serrano Heights | city | California | United States | 33.96 | -117.21 | 2037 | |
| Serrano Place | city | California | United States | 33.65 | -117.69 | 830 | |
| Serrano Village | city | California | United States | 34.18 | -117.32 | 1669 | |
| Sespe | city | California | United States | 34.40 | -118.95 | 390 | |
| Sespe Village | city | California | United States | 34.39 | -118.96 | 374 | |
| Seven Oaks | city | California | United States | 34.19 | -116.91 | 5869 | |
| Seven Pines | city | California | United States | 36.79 | -118.29 | 5987 | |
| Seven Trees | city | California | United States | 37.29 | -121.84 | 160 | |
| Seville | city | California | United States | 36.49 | -119.22 | 364 |