13 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Old Bridge | Middlesex County | 71,834 |
| Ocean | Monmouth County | 28,095 |
| Oakland | Bergen County | 13,059 |
| Ocean City | Cape May County | 11,194 |
| Ocean | Ocean County | 9,440 |
| Oradell | Bergen County | 8,431 |
| Oceanport | Monmouth County | 6,578 |
| Old Tappan | Bergen County | 6,550 |
| Oaklyn | Camden County | 4,000 |
| Oxford | Warren County | 2,485 |
| Ogdensburg | Sussex County | 2,324 |
| Ocean Gate | Ocean County | 1,994 |
| Oldmans | Salem County | 1,960 |