26 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pennsville township | 1 | 12,835 | 12,679 | 0.27% | 604 | 21.27 | Township |
| Pennsville | 2 | 12,348 | 11,968 | 0.25% | 1,152 | 10.72 | CDP |
| Pittsgrove township | 3 | 9,026 | 8,777 | 0.77% | 201 | 44.90 | Township |
| Carneys Point township | 4 | 8,588 | 8,637 | -0.3% | 508 | 16.91 | Township |
| Carneys Point | 5 | 8,325 | 7,302 | 0.76% | 994 | 8.38 | CDP |
| Salem | 6 | 5,343 | 5,297 | 0.17% | 2,279 | 2.34 | City |
| Salem city | 7 | 5,325 | 5,297 | 0% | 2,272 | 2.34 | City |
| Penns Grove borough | 8 | 4,881 | 4,843 | 0.16% | 5,466 | 0.89 | Borough |
| Penns Grove | 9 | 4,879 | 4,843 | 0.14% | 5,464 | 0.89 | Borough |
| Pilesgrove township | 10 | 4,258 | 4,184 | 0.4% | 122 | 34.94 | Township |
| Woodstown borough | 11 | 3,772 | 3,684 | 0.59% | 2,395 | 1.57 | Borough |
| Woodstown | 12 | 3,757 | 3,684 | 0.4% | 2,385 | 1.57 | Borough |
| Upper Pittsgrove township | 13 | 3,498 | 3,432 | 0.49% | 87 | 40.24 | Township |
| Alloway township | 14 | 3,345 | 3,281 | 0.39% | 100 | 33.48 | Township |
| Quinton township | 15 | 2,634 | 2,582 | 0.38% | 111 | 23.79 | Township |
| Oldmans township | 16 | 1,942 | 1,909 | 0.36% | 100 | 19.51 | Township |
| Lower Alloways Creek township | 17 | 1,746 | 1,718 | 0.29% | 39 | 45.31 | Township |
| Mannington township | 18 | 1,458 | 1,472 | -0.34% | 43 | 33.88 | Township |
| Alloway | 19 | 1,435 | 1,474 | 0.21% | 209 | 6.85 | CDP |
| Elmer | 20 | 1,383 | 1,345 | 0.58% | 1,556 | 0.89 | Borough |
| Elmer borough | 21 | 1,380 | 1,345 | 0.44% | 1,552 | 0.89 | Borough |
| Auburn | 22 | 1,330 | 828 | 7.17% | 313 | 4.25 | CDP |
| Elsinboro township | 23 | 1,012 | 1,001 | 0.3% | 85 | 11.93 | Township |
| Quinton | 24 | 433 | 369 | -2.26% | 489 | 0.89 | CDP |
| Hancocks Bridge | 25 | 371 | 308 | 1.92% | 1,627 | 0.23 | CDP |
| Pedricktown | 26 | 328 | 384 | -3.81% | 188 | 1.74 | CDP |
Pennsville township is the largest city in Salem County, with a population of 12,835.
Pedricktown is the smallest city in Salem County.
There are 26 cities in Salem County, New Jersey.