The municipalities of
Warren County
| TOWN | Est. | Formed from | Previously known as |
| Belvidere | 1845 | ||
| Hackettstown | 1853 | ||
| Phillipsburg | 1861 | ||
| TOWNSHIP | |||
| Allamuchy | 1873 | ||
| Blairstown | |||
| Franklin | 1839 | ||
| Frelinghuysen | 1848 | ||
| Greenwich | 1738 | ||
| Hardwick | 1750 | ||
| Harmony | 1839 | ||
| Hope | 1839 | ||
| Independence | 1782 | ||
| Knowlton | 1763 | ||
| Liberty | 1926 | Hope | |
| Lopatcong | 1863 | ||
| Mansfield | |||
| Oxford | 1754 | ||
| Pahaquarry | 1824 | ||
| Pohatcong | 1881 | ||
| Washington | 1849 | ||
| White | 1913 | ||
| BOROUGH | |||
| Alpha | 1911 | ||
| Washington | 1811 |
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