- Oberlochen
- Old Davis Mill Estates
- Oak Grove
- Ohio
- Old Dellwood
- Otter Creek
- Owen
- Oconee Springs
- Oasis
- Oklahoma Hills
- Olive Terrace
- Oak Hills
- Oakdale
- Old Ford Acres
- Overlook
- Oreburg
- Orsman
- Ogeechee
- Oak Village
- Oakbrook Forest
- Oakbrook Station
- Oakdale Woods
- Oakland North
- Old Suwanee Estates
- Overlook
- Oscarville
- Olive Branch
- Owens Island
- Old National East
- Ormewood