83 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Franklin | 1 | 70,857 | 68,362 | 1.42% | 1,535 | 46 | Township |
| Franklin | 2 | 70,857 | 68,315 | 1.42% | 1,535 | 46 | Township |
| Vernon | 3 | 23,027 | 22,351 | 0.65% | 341 | 68 | Township |
| Vernon | 4 | 23,027 | 22,291 | 0.65% | 341 | 68 | Township |
| Sparta | 5 | 20,507 | 19,600 | 0.71% | 558 | 37 | Township |
| Sparta | 6 | 20,507 | 19,623 | 0.71% | 558 | 37 | Township |
| Franklin | 7 | 16,815 | 16,373 | 0.74% | 301 | 56 | Township |
| Franklin | 8 | 16,815 | 16,374 | 0.74% | 301 | 56 | Township |
| Hopatcong | 9 | 14,860 | 14,367 | 0.75% | 1,366 | 11 | Borough |
| Hopatcong | 10 | 14,860 | 14,330 | 0.75% | 1,366 | 11 | Borough |
| Hopatcong | 11 | 14,855 | 14,367 | 0.71% | 1,365 | 11 | Borough |
| Hopatcong | 12 | 14,855 | 14,330 | 0.71% | 1,365 | 11 | Borough |
| Wantage | 13 | 11,174 | 10,815 | 0.78% | 167 | 67 | Township |
| Wantage | 14 | 11,174 | 10,788 | 0.78% | 167 | 67 | Township |
| Lake Mohawk | 15 | 9,650 | 9,148 | -0.19% | 1,922 | 5 | CDP |
| Newton | 16 | 8,620 | 8,368 | 2.19% | 2,565 | 3 | Town |
| Newton | 17 | 8,620 | 8,346 | 2.19% | 2,565 | 3 | Town |
| Hardyston | 18 | 8,525 | 8,130 | 0.63% | 267 | 32 | Township |
| Hardyston | 19 | 8,525 | 8,114 | 0.63% | 267 | 32 | Township |
| Newton | 20 | 8,457 | 8,368 | 0.26% | 2,517 | 3 | Town |
| Newton | 21 | 8,457 | 8,346 | 0.26% | 2,517 | 3 | Town |
| Byram | 22 | 8,274 | 8,027 | 0.69% | 384 | 22 | Township |
| Byram | 23 | 8,274 | 8,005 | 0.69% | 384 | 22 | Township |
| Andover | 24 | 5,731 | 6,010 | 0.81% | 286 | 20 | Township |
| Andover | 25 | 5,731 | 5,995 | 0.81% | 286 | 20 | Township |
| Frankford | 26 | 5,382 | 5,308 | 0.62% | 159 | 34 | Township |
| Frankford | 27 | 5,382 | 5,296 | 0.62% | 159 | 34 | Township |
| Highland Lakes | 28 | 5,111 | 4,666 | 7.15% | 1,183 | 4 | CDP |
| Franklin | 29 | 5,102 | 4,912 | 0.85% | 1,171 | 4 | Borough |
| Franklin | 30 | 5,102 | 4,896 | 0.85% | 1,171 | 4 | Borough |
| Franklin | 31 | 5,099 | 4,912 | 0.79% | 1,171 | 4 | Borough |
| Franklin | 32 | 5,099 | 4,896 | 0.79% | 1,171 | 4 | Borough |
| Stillwater | 33 | 4,119 | 4,001 | 0.64% | 153 | 27 | Township |
| Stillwater | 34 | 4,119 | 3,990 | 0.64% | 153 | 27 | Township |
| Montague | 35 | 3,906 | 3,791 | 0.67% | 86 | 45 | Township |
| Montague | 36 | 3,906 | 3,778 | 0.67% | 86 | 45 | Township |
| Green | 37 | 3,738 | 3,615 | 0.7% | 233 | 16 | Township |
| Green | 38 | 3,738 | 3,605 | 0.7% | 233 | 16 | Township |
| Stanhope | 39 | 3,622 | 3,525 | 0.64% | 1,971 | 2 | Borough |
| Stanhope | 40 | 3,622 | 3,515 | 0.64% | 1,971 | 2 | Borough |
| Stanhope | 41 | 3,620 | 3,525 | 0.58% | 1,970 | 2 | Borough |
| Stanhope | 42 | 3,620 | 3,515 | 0.58% | 1,970 | 2 | Borough |
| Hamburg | 43 | 3,374 | 3,267 | 0.69% | 2,947 | 1 | Borough |
| Hamburg | 44 | 3,374 | 3,258 | 0.69% | 2,947 | 1 | Borough |
| Hamburg | 45 | 3,372 | 3,267 | 0.63% | 2,945 | 1 | Borough |
| Hamburg | 46 | 3,372 | 3,258 | 0.63% | 2,945 | 1 | Borough |
| Fredon | 47 | 3,337 | 3,239 | 0.63% | 189 | 18 | Township |
| Fredon | 48 | 3,337 | 3,230 | 0.63% | 189 | 18 | Township |
| Franklin | 49 | 3,314 | 3,263 | 0.21% | 144 | 23 | Township |
| Franklin | 50 | 3,314 | 3,256 | 0.21% | 144 | 23 | Township |
| Franklin | 51 | 3,035 | 2,972 | 0.46% | 130 | 23 | Township |
| Franklin | 52 | 3,035 | 2,967 | 0.46% | 130 | 23 | Township |
| Byram Center | 53 | 2,461 | 2,017 | 7.14% | 860 | 3 | CDP |
| Lafayette | 54 | 2,451 | 2,355 | 0.91% | 137 | 18 | Township |
| Lafayette | 55 | 2,451 | 2,349 | 0.91% | 137 | 18 | Township |
| Ogdensburg | 56 | 2,324 | 2,258 | 0.61% | 1,054 | 2 | Borough |
| Ogdensburg | 57 | 2,324 | 2,252 | 0.61% | 1,054 | 2 | Borough |
| Ogdensburg | 58 | 2,324 | 2,258 | 0.61% | 1,054 | 2 | Borough |
| Ogdensburg | 59 | 2,324 | 2,252 | 0.61% | 1,054 | 2 | Borough |
| Sussex | 60 | 2,085 | 2,025 | 0.63% | 3,516 | 1 | Borough |
| Sussex | 61 | 2,085 | 2,019 | 0.63% | 3,516 | 1 | Borough |
| Sussex | 62 | 2,085 | 2,025 | 0.63% | 3,516 | 1 | Borough |
| Sussex | 63 | 2,085 | 2,019 | 0.63% | 3,516 | 1 | Borough |
| Sandyston | 64 | 2,034 | 1,983 | 0.59% | 49 | 41 | Township |
| Sandyston | 65 | 2,034 | 1,975 | 0.59% | 49 | 41 | Township |
| Vernon Center | 66 | 1,438 | 1,462 | -1.24% | 488 | 3 | CDP |
| Layton | 67 | 1,248 | 928 | 7.22% | 179 | 7 | CDP |
| Crandon Lakes | 68 | 1,132 | 1,221 | -0.26% | 443 | 3 | CDP |
| Vernon Valley | 69 | 948 | 1,171 | -4.63% | 356 | 3 | CDP |
| Branchville | 70 | 816 | 788 | 0.74% | 1,376 | 1 | Borough |
| Branchville | 71 | 816 | 786 | 0.74% | 1,376 | 1 | Borough |
| Branchville | 72 | 815 | 788 | 0.62% | 1,374 | 1 | Borough |
| Branchville | 73 | 815 | 786 | 0.62% | 1,374 | 1 | Borough |
| Andover | 74 | 614 | 596 | 0.66% | 455 | 1 | Borough |
| Andover | 75 | 614 | 594 | 0.66% | 455 | 1 | Borough |
| Andover | 76 | 614 | 596 | 0.66% | 455 | 1 | Borough |
| Andover | 77 | 614 | 594 | 0.66% | 455 | 1 | Borough |
| Silver Lake | 78 | 313 | 397 | -1.26% | 248 | 1 | CDP |
| Mount Hermon | 79 | 252 | 163 | 2.86% | 270 | 1 | CDP |
| Marksboro | 80 | 206 | 125 | 7.29% | 96 | 2 | CDP |
| Ross Corner | 81 | 82 | 209 | 6.49% | 46 | 2 | CDP |
| Walpack | 82 | 7 | 7 | 0% | 0.00 | 24 | Township |
| Walpack | 83 | 7 | 7 | 0% | 0.00 | 24 | Township |
Franklin is the largest city in Sussex County, with a population of 70,857.
Walpack is the smallest city in Sussex County, with a population of 7.
There are 83 cities in Sussex County, New Jersey.