| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oak Bottom (historical) | city | California | United States | 40.65 | -122.58 | 1220 | |
| Oak Creek Hills | city | California | United States | 38.71 | -121.08 | 830 | |
| Oak Gardens Estates | city | California | United States | 37.99 | -120.28 | 3349 | |
| Oak Glen | city | California | United States | 34.05 | -116.95 | 5029 | |
| Oak Glen | city | California | United States | 40.28 | -123.74 | 830 | |
| Oak Grove | city | California | United States | 33.39 | -116.79 | 2923 | |
| Oak Grove | city | California | United States | 36.45 | -118.79 | 2923 | |
| Oak Grove | city | California | United States | 38.12 | -120.89 | 298 | |
| Oak Grove | city | California | United States | 39.43 | -121.61 | 111 | |
| Oak Grove (historical) | city | California | United States | 39.34 | -121.32 | 1197 | |
| Oak Haven Estates | city | California | United States | 33.44 | -117.10 | 1197 | |
| Oak Hill | city | California | United States | 34.07 | -118.79 | 1669 | |
| Oak Hills | city | California | United States | 34.38 | -117.38 | 3727 | |
| Oak Hills | city | California | United States | 36.78 | -121.72 | 59 | |
| Oak Knoll | city | California | United States | 38.36 | -122.33 | 104 | |
| Oak Knoll | city | California | United States | 34.12 | -118.14 | 830 | |
| Oak Park | city | California | United States | 38.55 | -121.47 | 16 | |
| Oak Park | city | California | United States | 35.65 | -120.69 | 830 | |
| Oak Park | city | California | United States | 34.18 | -118.76 | 1023 | |
| Oak Park Estates | city | California | United States | 38.19 | -120.66 | 1253 | |
| Oak Ridge Mobile Estates | city | California | United States | 41.72 | -122.65 | 2798 | |
| Oak Ridge Village | city | California | United States | 38.68 | -121.08 | 830 | |
| Oak Run | city | California | United States | 40.69 | -122.02 | 1669 | |
| Oak Tree Village | city | California | United States | 38.71 | -121.08 | 830 | |
| Oak Valley | city | California | United States | 39.50 | -121.04 | 3349 | |
| Oak View | city | California | United States | 34.40 | -119.30 | 406 | |
| Oak Village | city | California | United States | 34.39 | -118.96 | 396 | |
| Oakbar | city | California | United States | 41.84 | -122.94 | 2650 | |
| Oakdale | city | California | United States | 37.77 | -120.85 | 134 | |
| Oakhurst | city | California | United States | 37.33 | -119.65 | 2509 | |
| Oakhurst (historical) | city | California | United States | 36.75 | -119.44 | 830 | |
| Oakland | city | California | United States | 37.80 | -122.27 | 3 | |
| Oakland i California | city | California | United States | 37.80 | -122.27 | 3 | |
| Oakley | city | California | United States | 38.00 | -121.71 | 13 | |
| Oakmont | city | California | United States | 38.44 | -122.60 | 830 | |
| Oakridge Ranches | city | California | United States | 33.61 | -116.98 | 2037 | |
| Oaks | city | California | United States | 35.12 | -120.59 | 62 | |
| Oaks Mobile Home And Recreational Vehicle Park | city | California | United States | 41.84 | -122.85 | 1797 | |
| Oakville | city | California | United States | 38.44 | -122.40 | 157 | |
| Oasis | city | California | United States | 33.47 | -116.10 | -1689 | |
| Oasis | city | California | United States | 38.98 | -123.00 | 2509 | |
| Oasis Mobile Home Park | city | California | United States | 33.79 | -117.92 | 98 |