23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jersey City | 1 | 307,433 | 291,960 | 1.52% | 20,846 | 15 | City |
| Jersey City | 2 | 305,540 | 291,960 | 0.9% | 20,717 | 15 | City |
| Bayonne | 3 | 77,174 | 71,603 | 3.54% | 13,258 | 6 | City |
| Bayonne | 4 | 75,264 | 71,603 | 0.98% | 12,930 | 6 | City |
| Union City | 5 | 67,921 | 68,138 | 1.5% | 52,775 | 1 | City |
| Union City | 6 | 66,613 | 68,138 | -0.46% | 51,758 | 1 | City |
| North Bergen | 7 | 62,610 | 62,913 | 1.53% | 12,202 | 5 | Township |
| Hoboken | 8 | 60,034 | 59,913 | 1.5% | 48,027 | 1 | City |
| Hoboken | 9 | 58,958 | 59,913 | -0.32% | 47,166 | 1 | City |
| West New York | 10 | 54,114 | 52,475 | 2.15% | 54,441 | 1 | Town |
| West New York | 11 | 53,100 | 52,475 | 0.24% | 53,421 | 1 | Town |
| Kearny | 12 | 41,496 | 41,710 | 1.54% | 4,692 | 9 | Town |
| Kearny | 13 | 40,655 | 41,710 | -0.52% | 4,597 | 9 | Town |
| Secaucus | 14 | 23,948 | 22,038 | 5.45% | 4,111 | 6 | Town |
| Harrison | 15 | 23,377 | 19,482 | 5.39% | 19,304 | 1 | Town |
| Secaucus | 16 | 22,878 | 22,038 | 0.74% | 3,927 | 6 | Town |
| Harrison | 17 | 22,857 | 19,482 | 3.04% | 18,874 | 1 | Town |
| Weehawken | 18 | 18,152 | 17,113 | 1.54% | 23,153 | 1 | Township |
| Harrison | 19 | 14,018 | 13,652 | 0.68% | 740 | 19 | Township |
| Guttenberg | 20 | 12,197 | 12,001 | 2.11% | 63,197 | 0 | Town |
| Guttenberg | 21 | 11,931 | 12,001 | -0.12% | 61,819 | 0 | Town |
| East Newark | 22 | 2,594 | 2,563 | 2.17% | 25,184 | 0 | Borough |
| East Newark | 23 | 2,533 | 2,563 | -0.24% | 24,592 | 0 | Borough |
Jersey City is the largest city in Hudson County, with a population of 307,433.
East Newark is the smallest city in Hudson County, with a population of 2,533.
There are 23 cities in Hudson County, New Jersey.