13 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Old Bridge | Middlesex County | 73,162 |
| Ocean | Monmouth County | 28,198 |
| Oakland | Bergen County | 13,192 |
| Ocean City | Cape May County | 11,169 |
| Ocean | Ocean County | 9,638 |
| Oradell | Bergen County | 8,518 |
| Oceanport | Monmouth County | 6,773 |
| Old Tappan | Bergen County | 6,758 |
| Oaklyn | Camden County | 4,021 |
| Oxford | Warren County | 2,493 |
| Ogdensburg | Sussex County | 2,338 |
| Ocean Gate | Ocean County | 2,001 |
| Oldmans | Salem County | 1,974 |