The municipalities of
Sussex County
| TOWN | Est. | Formed from | Previously known as |
| Newton | 1864 | ||
| TOWNSHIP | |||
| Andover | |||
| Byram | |||
| Frankford | 1797 | ||
| Fredon | 1904 | ||
| Green | 1824 | ||
| Hampton | 1864 | ||
| Hardyston | 1762 | ||
| Lafayette | 1845 | ||
| Montague | 1759 | ||
| Sandyston | 1762 | ||
| Sparta | 1845 | ||
| Stillwater | 1824 | ||
| Vernon | 1792 | ||
| Walpack | 1731 | ||
| Wantage | 1754 | ||
| BOROUGH | |||
| Andover | 1904 | Andover Twp | |
| Branchville | 1898 | ||
| Franklin | 1913 | ||
| Hamburg | 1920 | ||
| Hopatcong | 1898 | ||
| Ogdensburg | 1914 | ||
| Stanhope | 1904 | ||
| Sussex | 1902 |
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