There are 27 cities in Sussex County, New Jersey.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Hopatcong | 1 | New Jersey | 14,735 | 14,327 | 0.7% | 1,354 | 10.88 |
| Lake Hopatcong | 2 | New Jersey | 10,398 | 10,301 | -0.39% | 1,408 | 7.39 |
| Lake Mohawk | 3 | New Jersey | 10,103 | 9,148 | 2.02% | 2,012 | 5.02 |
| Newton | 4 | New Jersey | 8,581 | 8,351 | 0.68% | 2,554 | 3.36 |
| Franklin | 5 | New Jersey | 5,038 | 4,896 | 0.72% | 1,157 | 4.36 |
| Stanhope | 6 | New Jersey | 3,603 | 3,517 | 0.61% | 1,960 | 1.84 |
| Highland Lakes | 7 | New Jersey | 3,512 | 4,666 | -7.58% | 813 | 4.32 |
| Upper Greenwood Lake | 8 | New Jersey | 3,452 | 3,883 | 0.5% | 1,260 | 2.74 |
| Hamburg | 9 | New Jersey | 3,354 | 3,262 | 0.69% | 2,929 | 1.15 |
| Hewitt | 10 | New Jersey | 2,544 | 2,612 | 0.08% | 550 | 4.62 |
| Ogdensburg | 11 | New Jersey | 2,313 | 2,253 | 0.65% | 1,049 | 2.20 |
| Sussex | 12 | New Jersey | 2,076 | 2,020 | 0.68% | 3,501 | 0.59 |
| Byram Center | 13 | New Jersey | 1,921 | 2,017 | -1.23% | 671 | 2.86 |
| Vernon Center | 14 | New Jersey | 1,524 | 1,462 | 1.06% | 517 | 2.95 |
| Crandon Lakes | 15 | New Jersey | 1,061 | 1,221 | -3.63% | 415 | 2.56 |
| Layton | 16 | New Jersey | 1,034 | 928 | 1.77% | 148 | 6.98 |
| Vernon Valley | 17 | New Jersey | 997 | 1,171 | -4.13% | 374 | 2.67 |
| Branchville | 18 | New Jersey | 817 | 787 | 0.99% | 1,378 | 0.59 |
| Andover | 19 | New Jersey | 609 | 593 | 0.66% | 452 | 1.35 |
| Johnsonburg | 20 | New Jersey | 577 | 363 | 10.32% | 542 | 1.06 |
| Mount Hermon | 21 | New Jersey | 290 | 163 | 11.54% | 311 | 0.93 |
| Hope | 22 | New Jersey | 273 | 153 | 10.98% | 377 | 0.72 |
| Blairstown | 23 | New Jersey | 266 | 268 | 0% | 635 | 0.42 |
| Silver Lake | 24 | New Jersey | 256 | 397 | -11.72% | 203 | 1.26 |
| Marksboro | 25 | New Jersey | 205 | 125 | 10.81% | 95 | 2.15 |
| Allamuchy | 26 | New Jersey | 90 | 114 | -6.25% | 35 | 2.58 |
| Ross Corner | 27 | New Jersey | 0 | 209 | 0% | 0 | 1.78 |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Hopatcong is the largest city in Sussex County.
Ross Corner is the smallest city in Sussex County.
There are 27 cities in Sussex County, New Jersey.