- Oak Park (Population: 2,320)
- Oak View (Population: 4,199)
- Oakdale (Population: 15,503)
- Oakhurst (Population: 2,868)
- Oakland (Population: 399,484)
- Oakley (Population: 25,619)
- Occidental (Population: 1,272)
- Oceano (Population: 7,260)
- Oceanside (Population: 161,029)
- Oildale (Population: 27,885)
- Ojai (Population: 7,862)
- Olivehurst (Population: 11,061)
- Ontario (Population: 158,007)
- Opal Cliffs (Population: 6,458)
- Orange (Population: 128,821)
- Orange Cove (Population: 7,722)
- Orangevale (Population: 26,705)
- Orcutt (Population: 28,830)
- Orinda (Population: 17,599)
- Orland (Population: 6,281)
- Orosi (Population: 7,318)
- Oroville (Population: 13,004)
- Oroville East (Population: 8,680)
- Oxnard (Population: 170,358)
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