- O'Bryonsville
- O'Connor Point
- Oak
- Oak Avenue Mobile Home Park
- Oak Forest
- Oak Grove
- Oak Grove
- Oak Harbor
- Oak Hill
- Oak Hill
- Oak Hill Mobile Home Park
- Oak Hill Mobile Home Village
- Oak Knoll
- Oak Leaf Mobile Home Park
- Oak Manor
- Oak Meadows
- Oak Mobile Home Court
- Oak Park
- Oak Park
- Oak Park Mobile Home Park
- Oak Ridge
- Oak Ridge
- Oak Run
- Oakdale
- Oakdale
- Oakdale
- Oakdale
- Oakfield
- Oakfield
- Oakgrove