| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Occidental | city | California | United States | 38.41 | -122.95 | 830 | |
| Ocean Beach | city | California | United States | 32.74 | -117.26 | 3 | |
| Ocean Breeze Mobile Home Park | city | California | United States | 36.96 | -121.98 | 39 | |
| Ocean Breeze Trailer Park | city | California | United States | 33.76 | -117.96 | 29 | |
| Ocean Hills | city | California | United States | 33.16 | -117.26 | 396 | |
| Ocean Park | city | California | United States | 34.00 | -118.48 | 3 | |
| Ocean Roar | city | California | United States | 38.22 | -122.92 | 196 | |
| Ocean View | city | California | United States | 33.72 | -117.99 | 13 | |
| Ocean View Estates | city | California | United States | 33.70 | -118.01 | 32 | |
| Ocean West Mobile Home Park | city | California | United States | 40.96 | -124.11 | 177 | |
| Oceana | city | California | United States | 33.21 | -117.33 | 196 | |
| Oceano | city | California | United States | 35.10 | -120.61 | 39 | |
| Oceano Beach | city | California | United States | 35.11 | -120.63 | 13 | |
| Oceanside | city | California | United States | 33.20 | -117.38 | 32 | |
| Oceanview | city | California | United States | 37.71 | -122.44 | 830 | |
| Ockenden | city | California | United States | 37.09 | -119.32 | 5869 | |
| Ocotillo | city | California | United States | 32.74 | -115.99 | 380 | |
| Ocotillo Wells | city | California | United States | 33.14 | -116.13 | 193 | |
| Octol | city | California | United States | 36.12 | -119.33 | 249 |