California cities which start with the letter O.
| Place | Place Type | 2010 Population |
|---|---|---|
| O Neals | ||
| Oak Glen | ||
| Oak Grove | ||
| Oak Hills | ||
| Oak Park | ||
| Oak Park | ||
| Oak Run | ||
| Oak Shores | ||
| Oak View | ||
| Oakdale | city | 20675 |
| Oakhurst | ||
| Oakland | city | 390724 |
| Oakland Intrntl Service Ctr | ||
| Oakley | city | 35432 |
| Oakville | ||
| Oakwood | ||
| Obrien | ||
| Occidental | ||
| Ocean Beach | ||
| Oceano | ||
| Oceanside | city | 167086 |
| Ocotillo | ||
| Ojai | city | 7461 |
| Olancha | ||
| Old Fort Jim | ||
| Old Station | ||
| Olema | ||
| Olinda | ||
| Olivehurst | ||
| Olivenhain | ||
| Olympic Valley | ||
| Omo Ranch | ||
| One Hundred Palms | ||
| Onizuka Afb | ||
| Ono | ||
| Ontario | city | 163924 |
| Onyx | ||
| Ophir | ||
| Orange | city | 136416 |
| Orange Cove | city | 9078 |
| Orangevale | ||
| Orcutt | ||
| Ordbend | ||
| Oregon City | ||
| Oregon House | ||
| Orick | ||
| Orinda | city | 17643 |
| Orland | city | 7291 |
| Orleans | ||
| Oro Grande | ||
| Orosi | ||
| Oroville | city | 15546 |
| Oroville | city | 15546 |
| Outingdale | ||
| Ovale | ||
| Oxnard | city | 197899 |
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