- Osborn Island
- Osbornes Mills
- Osborn Mills
- Oak Glen
- Oak Hill
- Oak Ridge
- Oak Ridge Estates
- Oakwood
- Ocean Beach
- Ortley Beach
- Ortley Terrace
- Osborne Island
- Osbornsville
- Oakland
- Oakwood Beach
- Oldmans
- Ordmont
- Oakwood Park
- Overlook
- Oakland
- Orange
- Oxford
- Oakhurst
- Ocean City
- Ocean Grove
- Ogdensburg
- Olivet
- Oak Ridge
- Ocean View
- Oceanville