30 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newark | 1 | 325,381 | 310,665 | 2.55% | 13,477 | 24 | City |
| Newark | 2 | 318,962 | 310,665 | 0.52% | 13,211 | 24 | City |
| East Orange | 3 | 72,960 | 69,419 | 1.54% | 18,574 | 4 | City |
| East Orange | 4 | 72,457 | 69,419 | 0.84% | 18,446 | 4 | City |
| Irvington | 5 | 62,773 | 60,900 | 1.51% | 21,542 | 3 | Township |
| Bloomfield | 6 | 56,249 | 52,864 | 1.5% | 10,539 | 5 | Township |
| West Orange | 7 | 49,862 | 48,693 | 1.32% | 4,154 | 12 | Township |
| Montclair | 8 | 41,678 | 39,849 | 1.47% | 6,681 | 6 | Township |
| Belleville | 9 | 39,260 | 38,076 | 1.52% | 11,911 | 3 | Township |
| City of Orange | 10 | 35,855 | 34,263 | 2.21% | 16,202 | 2 | Township |
| Livingston | 11 | 32,695 | 31,263 | 1.66% | 2,372 | 14 | Township |
| Nutley | 12 | 30,984 | 30,038 | 1.56% | 9,189 | 3 | Township |
| Maplewood | 13 | 26,524 | 25,568 | 1.52% | 6,847 | 4 | Township |
| Millburn | 14 | 23,284 | 21,635 | 2.32% | 2,495 | 9 | Township |
| South Orange Village | 15 | 18,986 | 18,438 | 1.33% | 6,671 | 3 | Township |
| Verona | 16 | 15,007 | 14,562 | 1.54% | 5,371 | 3 | Township |
| Cedar Grove | 17 | 13,973 | 13,081 | 1.5% | 3,298 | 4 | Township |
| West Caldwell | 18 | 11,317 | 10,995 | 1.43% | 2,220 | 5 | Township |
| Caldwell | 19 | 9,701 | 8,973 | 4.02% | 8,235 | 1 | Borough |
| Caldwell | 20 | 9,414 | 8,973 | 0.94% | 7,992 | 1 | Borough |
| Fairfield | 21 | 8,329 | 7,841 | 1.52% | 823 | 10 | Township |
| Glen Ridge | 22 | 8,328 | 7,753 | 1.51% | 6,532 | 1 | Borough |
| Glen Ridge | 23 | 8,316 | 7,753 | 1.37% | 6,522 | 1 | Borough |
| North Caldwell | 24 | 6,872 | 6,653 | 1.52% | 2,240 | 3 | Borough |
| North Caldwell | 25 | 6,798 | 6,653 | 0.43% | 2,216 | 3 | Borough |
| Roseland | 26 | 6,467 | 6,272 | 1.52% | 1,787 | 4 | Borough |
| Roseland | 27 | 6,394 | 6,272 | 0.38% | 1,767 | 4 | Borough |
| Fairfield | 28 | 5,416 | 5,532 | 0.39% | 132 | 41 | Township |
| Essex Fells | 29 | 2,259 | 2,219 | 1.76% | 1,604 | 1 | Borough |
| Essex Fells | 30 | 2,220 | 2,219 | 0% | 1,577 | 1 | Borough |
Newark is the largest city in Essex County, with a population of 325,381.
Essex Fells is the smallest city in Essex County, with a population of 2,220.
There are 30 cities in Essex County, New Jersey.