- Oakville
- Ocean Heights
- Oyster Creek
- Oak Island
- Oak Shade
- Oakwood Lakes
- Oliphants Mills
- Ong
- Orchard View
- Oriental
- Osage
- Overbrook
- Outer Island
- Ogden
- Orchard Center
- Ormond
- Othello
- Oak Island Junction
- Oak Grove
- Old Mill Farms
- Oak Tree
- Orchard Heights
- Outcalt
- Oak Glen
- Oak Hill
- Oak Hill
- Oakhurst Manor
- Oakland Mills
- Oceanic
- Orchard Estates