- Ocean Heights
- Ocean View
- Oceanic
- Oceanport
- Oceanville
- Ogden
- Ogdensburg
- Old Bridge
- Old Mill Farms
- Old Tappan
- Oldmans
- Oldwick
- Oliphants Mills
- Olivet
- Ong
- Oradell
- Orange
- Orchard Center
- Orchard Estates
- Orchard Heights
- Orchard View
- Ordmont
- Oriental
- Ormond
- Ortley Beach
- Ortley Terrace
- Osage
- Osborn Island
- Osborn Mills
- Osborne Island