23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jersey City city | 1 | 295,427 | 291,949 | 0.64% | 20,032 | 14.75 | City |
| Jersey City | 2 | 291,462 | 291,949 | -0.03% | 19,763 | 14.75 | City |
| Bayonne city | 3 | 71,908 | 71,601 | 1.13% | 12,353 | 5.82 | City |
| Bayonne | 4 | 69,432 | 71,601 | -0.62% | 11,928 | 5.82 | City |
| Union City city | 5 | 63,916 | 68,138 | -0.43% | 49,663 | 1.29 | City |
| Union City | 6 | 62,011 | 68,138 | -1.94% | 48,183 | 1.29 | City |
| North Bergen township | 7 | 58,874 | 62,916 | -0.44% | 11,474 | 5.13 | Township |
| Hoboken city | 8 | 56,656 | 59,909 | -0.31% | 45,325 | 1.25 | City |
| Hoboken | 9 | 55,077 | 59,909 | -1.72% | 44,062 | 1.25 | City |
| West New York town | 10 | 50,798 | 52,542 | 0.04% | 51,105 | 0.99 | Town |
| West New York | 11 | 49,562 | 52,542 | -1.19% | 49,861 | 0.99 | Town |
| Kearny town | 12 | 39,084 | 41,706 | -0.36% | 4,419 | 8.84 | Town |
| Kearny | 13 | 37,812 | 41,706 | -2.02% | 4,275 | 8.84 | Town |
| Harrison town | 14 | 22,332 | 19,480 | 4.23% | 18,441 | 1.21 | Town |
| Harrison | 15 | 21,213 | 19,480 | 1.66% | 17,517 | 1.21 | Town |
| Secaucus town | 16 | 20,701 | 22,037 | -0.73% | 3,553 | 5.83 | Town |
| Secaucus | 17 | 20,317 | 22,037 | -1.66% | 3,487 | 5.83 | Town |
| Weehawken township | 18 | 18,145 | 17,108 | 2.65% | 23,144 | 0.78 | Township |
| Harrison township | 19 | 13,872 | 13,649 | 0.24% | 733 | 18.93 | Township |
| Guttenberg town | 20 | 11,387 | 11,930 | 0.1% | 59,000 | 0.19 | Town |
| Guttenberg | 21 | 10,988 | 11,930 | -1.68% | 56,933 | 0.19 | Town |
| East Newark borough | 22 | 2,426 | 2,563 | -0.04% | 23,553 | 0.10 | Borough |
| East Newark | 23 | 2,338 | 2,563 | -1.89% | 22,699 | 0.10 | Borough |
Jersey City city is the largest city in Hudson County, with a population of 295,427.
East Newark is the smallest city in Hudson County.
There are 23 cities in Hudson County, New Jersey.