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 | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pennsville township | 1 | 12,800 | 12,679 | 0.27% | 602 | 21.3 | Township |
| Pittsgrove township | 2 | 8,957 | 8,777 | 0.78% | 199 | 44.9 | Township |
| Carneys Point township | 3 | 8,614 | 8,637 | -0.3% | 509 | 16.9 | Township |
| Salem | 4 | 5,325 | 5,297 | 0% | 2,272 | 2.3 | City |
| Penns Grove borough | 5 | 4,873 | 4,843 | 0.16% | 5,457 | 0.9 | Borough |
| Pilesgrove township | 6 | 4,241 | 4,184 | 0.4% | 121 | 34.9 | Township |
| Woodstown borough | 7 | 3,750 | 3,684 | 0.59% | 2,381 | 1.6 | Borough |
| Upper Pittsgrove township | 8 | 3,481 | 3,432 | 0.49% | 86 | 40.2 | Township |
| Alloway township | 9 | 3,332 | 3,281 | 0.39% | 100 | 33.5 | Township |
| Quinton township | 10 | 2,624 | 2,582 | 0.38% | 110 | 23.8 | Township |
| Oldmans township | 11 | 1,935 | 1,909 | 0.36% | 99 | 19.5 | Township |
| Lower Alloways Creek township | 12 | 1,741 | 1,718 | 0.29% | 38 | 45.3 | Township |
| Mannington township | 13 | 1,463 | 1,472 | -0.34% | 43 | 33.9 | Township |
| Elmer borough | 14 | 1,374 | 1,345 | 0.44% | 1,546 | 0.9 | Borough |
| Elsinboro township | 15 | 1,009 | 1,001 | 0.3% | 85 | 11.9 | Township |
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.
Pennsville township is the largest city in Salem County.
Elsinboro township is the smallest city in Salem County.
There are 15 cities in Salem County, New Jersey.