| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monroe | 1 | 38,338 | 37,143 | 0.53% | 826 | 46 | Township |
| Deptford | 2 | 32,671 | 31,996 | 0.22% | 1,885 | 17 | Township |
| Glassboro | 3 | 24,686 | 23,163 | 0.83% | 2,649 | 9 | Borough |
| West Deptford | 4 | 22,737 | 22,225 | 0.25% | 1,480 | 15 | Township |
| Mantua | 5 | 15,627 | 15,245 | 0.29% | 976 | 16 | Township |
| Woolwich | 6 | 15,068 | 12,657 | 1.41% | 715 | 21 | Township |
| East Greenwich | 7 | 12,672 | 11,764 | 0.49% | 877 | 14 | Township |
| Woodbury | 8 | 10,148 | 9,953 | 0.18% | 5,024 | 2 | City |
| Clayton | 9 | 9,080 | 8,806 | 0.43% | 1,283 | 7 | Borough |
| Pitman | 10 | 8,987 | 8,787 | 0.29% | 4,052 | 2 | Borough |
| Paulsboro | 11 | 6,347 | 6,199 | 0.28% | 3,299 | 2 | Borough |
| Logan | 12 | 6,144 | 6,000 | 0.29% | 280 | 22 | Township |
| Elk | 13 | 4,537 | 4,418 | 0.38% | 237 | 19 | Township |
| Westville | 14 | 4,370 | 4,267 | 0.3% | 4,268 | 1 | Borough |
| South Harrison | 15 | 3,502 | 3,390 | 0.66% | 220 | 16 | Township |
| Woodbury Heights | 16 | 3,174 | 3,099 | 0.38% | 2,547 | 1 | Borough |
| National Park | 17 | 3,097 | 3,029 | 0.29% | 3,072 | 1 | Borough |
| Swedesboro | 18 | 2,769 | 2,711 | 0.11% | 3,788 | 1 | Borough |
| Wenonah | 19 | 2,337 | 2,282 | 0.3% | 2,346 | 1 | Borough |
| Newfield | 20 | 1,828 | 1,786 | 0.27% | 1,052 | 2 | Borough |
Monroe is the largest city in Gloucester County, with a population of 38,338.
Newfield is the smallest city in Gloucester County, with a population of 1,828.
There are 20 cities in Gloucester County, New Jersey.