7 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kearny town | Hudson County | 39,084 |
| Kinnelon borough | Morris County | 10,079 |
| Keansburg borough | Monmouth County | 9,536 |
| Kenilworth borough | Union County | 8,237 |
| Keyport borough | Monmouth County | 7,005 |
| Kingwood township | Hunterdon County | 3,867 |
| Knowlton township | Warren County | 2,944 |