- Oak Valley (Population: 3,747)
- Oakhurst (Population: 4,152)
- Oakland (Population: 12,466)
- Oaklyn (Population: 4,188)
- Ocean Acres (Population: 13,155)
- Ocean City (Population: 15,378)
- Ocean Gate (Population: 2,076)
- Ocean Grove (Population: 4,256)
- Oceanport (Population: 5,807)
- Ogdensburg (Population: 2,638)
- Old Bridge (Population: 22,833)
- Old Tappan (Population: 5,482)
- Olivet (Population: 1,420)
- Oradell (Population: 8,047)
- Orange (Population: 32,868)
- Oxford (Population: 2,283)
