40 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newark city | 1 | 305,776 | 310,645 | 0.13% | 12,665 | 24.14 | City |
| Newark | 2 | 301,170 | 310,645 | -0.63% | 12,474 | 24.14 | City |
| East Orange city | 3 | 70,796 | 69,375 | 0.88% | 18,023 | 3.93 | City |
| East Orange | 4 | 69,676 | 69,375 | 0.09% | 17,738 | 3.93 | City |
| Irvington township | 5 | 59,745 | 60,915 | -0.15% | 20,503 | 2.91 | Township |
| Bloomfield township | 6 | 55,146 | 52,871 | 1.33% | 10,333 | 5.34 | Township |
| West Orange township | 7 | 47,681 | 48,697 | -0.2% | 3,972 | 12 | Township |
| Montclair township | 8 | 39,671 | 39,825 | -0.16% | 6,360 | 6.24 | Township |
| Belleville township | 9 | 37,343 | 38,073 | -0.15% | 11,330 | 3.30 | Township |
| City of Orange township | 10 | 33,953 | 34,309 | 0.25% | 15,343 | 2.21 | Township |
| Livingston township | 11 | 31,087 | 31,243 | 0% | 2,255 | 13.79 | Township |
| Nutley township | 12 | 29,452 | 30,038 | -0.15% | 8,734 | 3.37 | Township |
| Maplewood township | 13 | 25,491 | 25,582 | 0.33% | 6,580 | 3.87 | Township |
| Millburn township | 14 | 21,777 | 21,633 | -0.19% | 2,333 | 9.33 | Township |
| South Orange Village township | 15 | 18,162 | 18,427 | -0.13% | 6,382 | 2.85 | Township |
| Short Hills | 16 | 14,769 | 13,700 | 0.73% | 2,809 | 5.26 | CDP |
| Verona township | 17 | 14,286 | 14,575 | -0.13% | 5,113 | 2.79 | Township |
| Cedar Grove township | 18 | 13,299 | 13,057 | -0.08% | 3,139 | 4.24 | Township |
| Upper Montclair | 19 | 12,660 | 11,439 | 0.58% | 5,319 | 2.38 | CDP |
| West Caldwell township | 20 | 10,763 | 10,975 | -0.17% | 2,112 | 5.10 | Township |
| Brookdale | 21 | 10,580 | 9,604 | 0.85% | 6,600 | 1.60 | CDP |
| Watsessing | 22 | 9,650 | 7,094 | 7.14% | 15,590 | 0.62 | CDP |
| Caldwell borough | 23 | 8,804 | 8,986 | -0.17% | 7,474 | 1.18 | Borough |
| Caldwell | 24 | 8,732 | 8,986 | -0.58% | 7,413 | 1.18 | Borough |
| Glen Ridge | 25 | 8,082 | 7,757 | 0.81% | 6,339 | 1.27 | Borough |
| Fairfield township | 26 | 7,929 | 7,837 | -0.08% | 783 | 10.13 | Township |
| Glen Ridge borough | 27 | 7,928 | 7,757 | -0.15% | 6,218 | 1.27 | Borough |
| North Caldwell borough | 28 | 6,554 | 6,672 | -0.15% | 2,136 | 3.07 | Borough |
| North Caldwell | 29 | 6,508 | 6,672 | -0.5% | 2,121 | 3.07 | Borough |
| Ampere North | 30 | 6,455 | 5,145 | 7.14% | 23,219 | 0.28 | CDP |
| Roseland borough | 31 | 6,150 | 6,270 | -0.15% | 1,700 | 3.62 | Borough |
| Roseland | 32 | 6,100 | 6,270 | -0.55% | 1,686 | 3.62 | Borough |
| Fairfield township | 33 | 5,382 | 5,529 | 0.39% | 131 | 41.13 | Township |
| Great Notch | 34 | 5,022 | 4,277 | 7.12% | 5,063 | 0.99 | CDP |
| Silver Lake | 35 | 4,448 | 3,970 | 0.32% | 13,644 | 0.33 | CDP |
| Pleasantdale | 36 | 3,077 | 2,466 | 7.14% | 3,895 | 0.79 | CDP |
| Montclair State University | 37 | 2,142 | 1,285 | 7.1% | 6,017 | 0.36 | CDP |
| Essex Fells borough | 38 | 2,110 | 2,212 | -0.66% | 1,499 | 1.41 | Borough |
| Essex Fells | 39 | 2,088 | 2,212 | -1.18% | 1,483 | 1.41 | Borough |
| Llewellyn Park | 40 | 851 | 381 | 7.18% | 1,192 | 0.71 | CDP |
Newark city is the largest city in Essex County, with a population of 305,776.
Llewellyn Park is the smallest city in Essex County.
There are 40 cities in Essex County, New Jersey.