- Oak Glen
- Oak Hills
- Oak Park
- Oak Run
- Oak Shores
- Oak View
- Oakdale
- Oakhurst
- Oakhurst-North Fork
- Oakland
- Oakley
- Oasis
- Oceano
- Oceanside
- Oceanside-Escondido
- Ocotillo
- Oildale
- Ojai
- Ojai-Mira Monte
- Old Fig Garden
- Old Stine
- Olivehurst
- Olympic Valley
- O'neals
- Ontario
- Onyx
- Orange
- Orange Blossom
- Orange Cove
- Orangevale
- Orcutt
- Oregon House
- Orinda
- Orland
- Oro Grande
- Orosi
- Orosi-Cutler
- Oroville
- Oroville East
- Oxnard
California Homes for sale & real estate cities starting with "O"
California Cities starting With "O"
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