| City | County | 2026 Pop. ↓ |
|---|---|---|
| Old Bridge | Middlesex County | 70,634 |
| Ocean | Monmouth County | 28,124 |
| Oakland | Bergen County | 12,836 |
| Ocean City | Cape May County | 10,969 |
| Ocean | Ocean County | 9,359 |
| Oradell | Bergen County | 8,287 |
| Old Tappan | Bergen County | 7,061 |
| Oceanport | Monmouth County | 6,684 |
| Oaklyn | Camden County | 3,998 |
| Oxford | Warren County | 2,453 |
| Ogdensburg | Sussex County | 2,328 |
| Ocean Gate | Ocean County | 2,016 |
| Oldmans | Salem County | 1,961 |