California cities starting with O
- Oakdale, CA 19
- Oakhurst, CA 16
- Oakland, CA 304
- Oakley, CA 19
- Oak View, CA 6
- Oceano, CA 7
- Oceanside, CA 87
- Ojai, CA 20
- Olivehurst, CA 12
- Ontario, CA 104
- Orange, CA 92
- Orange Cove, CA 9
- Orangevale, CA 20
- Orcutt, CA 7
- Orinda, CA 9
- Orland, CA 20
- Orosi, CA 9
- Oroville, CA 35
- Oxnard, CA 81