| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newark | 1 | 327,454 | 310,567 | 1.13% | 13,563 | 24 | City |
| East Orange | 2 | 72,217 | 69,428 | 0.08% | 18,385 | 4 | City |
| Irvington | 3 | 62,255 | 60,837 | 0.04% | 21,364 | 3 | Township |
| Bloomfield | 4 | 56,948 | 52,861 | 1.02% | 10,670 | 5 | Township |
| West Orange | 5 | 49,583 | 48,684 | 0.05% | 4,131 | 12 | Township |
| Montclair | 6 | 44,647 | 39,869 | 0.03% | 7,157 | 6 | Township |
| Belleville | 7 | 39,014 | 38,107 | 0.04% | 11,837 | 3 | Township |
| City of Orange | 8 | 35,945 | 34,249 | 0.85% | 16,243 | 2 | Township |
| Livingston | 9 | 32,084 | 31,300 | -0.43% | 2,327 | 14 | Township |
| Nutley | 10 | 30,757 | 30,044 | 0.04% | 9,121 | 3 | Township |
| Maplewood | 11 | 26,329 | 25,566 | 0.03% | 6,796 | 4 | Township |
| Millburn | 12 | 22,830 | 21,635 | -0.19% | 2,446 | 9 | Township |
| South Orange Village | 13 | 19,423 | 18,435 | 1.48% | 6,825 | 3 | Township |
| Verona | 14 | 15,339 | 14,552 | 1.54% | 5,490 | 3 | Township |
| Cedar Grove | 15 | 13,924 | 13,118 | 0.06% | 3,286 | 4 | Township |
| West Caldwell | 16 | 11,241 | 10,985 | 0.32% | 2,205 | 5 | Township |
| Caldwell | 17 | 9,376 | 8,960 | 0.01% | 7,959 | 1 | Borough |
| Fairfield | 18 | 8,420 | 7,851 | 0.89% | 832 | 10 | Township |
| Glen Ridge | 19 | 8,259 | 7,749 | 0% | 6,478 | 1 | Borough |
| North Caldwell | 20 | 6,818 | 6,648 | 0.04% | 2,222 | 3 | Borough |
| Roseland | 21 | 6,421 | 6,269 | 0.06% | 1,775 | 4 | Borough |
| Fairfield | 22 | 5,461 | 5,535 | 0.39% | 133 | 41 | Township |
| Essex Fells | 23 | 2,233 | 2,220 | -0.09% | 1,586 | 1 | Borough |
Newark is the largest city in Essex County, with a population of 327,454.
Essex Fells is the smallest city in Essex County, with a population of 2,233.
There are 23 cities in Essex County, New Jersey.