There are 38 cities in California that start with the letter O.
City | 2024 Population |
|---|---|
| Oak Glen | 324 |
| Oak Hills | 7,664 |
| Oak Park | 13,596 |
| Oak Run | 654 |
| Oak Shores | 129 |
| Oak View | 6,868 |
| Oakdale | 22,988 |
| Oakhurst | 5,365 |
| Oakland | 435,024 |
| Oakley | 46,521 |
| Oasis | 3,256 |
| Occidental | 1,052 |
| Oceano | 7,287 |
| Oceanside | 168,705 |
| Ocotillo | 126 |
| Oildale | 35,148 |
| Ojai | 7,410 |
| Olancha | 168 |
| Old Fig Garden | 5,121 |
| Old River | 124 |
| Old Stine | 4,214 |
| Olde Stockdale | 634 |
| Olivehurst | 18,043 |
| Ono | 32 |
| Ontario | 184,705 |
| Onyx | 673 |
| Orange | 137,965 |
| Orange Blossom | 1,773 |
| Orange Cove | 9,447 |
| Orangevale | 36,167 |
| Orcutt | 31,509 |
| Orick | 300 |
| Orinda | 19,314 |
| Orland | 8,067 |
| Orosi | 9,155 |
| Oroville | 19,267 |
| Oroville East | 7,533 |
| Oxnard | 197,347 |