23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newark | 1 | 305,776 | 310,645 | 0.13% | 12,665 | 24.14 | City |
| East Orange | 2 | 70,796 | 69,375 | 0.88% | 18,023 | 3.93 | City |
| Irvington township | 3 | 59,745 | 60,915 | -0.15% | 20,503 | 2.91 | Township |
| Bloomfield township | 4 | 55,146 | 52,871 | 1.33% | 10,333 | 5.34 | Township |
| West Orange township | 5 | 47,681 | 48,697 | -0.2% | 3,972 | 12 | Township |
| Montclair township | 6 | 39,671 | 39,825 | -0.16% | 6,360 | 6.24 | Township |
| Belleville township | 7 | 37,343 | 38,073 | -0.15% | 11,330 | 3.30 | Township |
| City of Orange township | 8 | 33,953 | 34,309 | 0.24% | 15,343 | 2.21 | Township |
| Livingston township | 9 | 31,087 | 31,243 | 0% | 2,255 | 13.79 | Township |
| Nutley township | 10 | 29,452 | 30,038 | -0.15% | 8,734 | 3.37 | Township |
| Maplewood township | 11 | 25,491 | 25,582 | 0.34% | 6,580 | 3.87 | Township |
| Millburn township | 12 | 21,777 | 21,633 | -0.19% | 2,333 | 9.33 | Township |
| South Orange Village township | 13 | 18,162 | 18,427 | -0.13% | 6,382 | 2.85 | Township |
| Verona township | 14 | 14,286 | 14,575 | -0.13% | 5,113 | 2.79 | Township |
| Cedar Grove township | 15 | 13,299 | 13,057 | -0.08% | 3,139 | 4.24 | Township |
| West Caldwell township | 16 | 10,763 | 10,975 | -0.17% | 2,112 | 5.10 | Township |
| Caldwell borough | 17 | 8,804 | 8,986 | -0.17% | 7,474 | 1.18 | Borough |
| Fairfield township | 18 | 7,929 | 7,837 | -0.08% | 783 | 10.13 | Township |
| Glen Ridge borough | 19 | 7,928 | 7,757 | -0.15% | 6,218 | 1.27 | Borough |
| North Caldwell borough | 20 | 6,554 | 6,672 | -0.15% | 2,136 | 3.07 | Borough |
| Roseland borough | 21 | 6,150 | 6,270 | -0.15% | 1,700 | 3.62 | Borough |
| Fairfield township | 22 | 5,382 | 5,529 | 0.39% | 131 | 41.13 | Township |
| Essex Fells borough | 23 | 2,110 | 2,212 | -0.66% | 1,499 | 1.41 | Borough |
Newark is the largest city in Essex County, with a population of 305,776.
Essex Fells borough is the smallest city in Essex County.
There are 23 cities in Essex County, New Jersey.