| Rank | County | Population Density |
|---|---|---|
| 1 | Hudson County, New Jersey | 13,731.4 |
| 2 | Essex County, New Jersey | 6,211.5 |
| 3 | Union County, New Jersey | 5,216.1 |
| 4 | Bergen County, New Jersey | 3,884.5 |
| 5 | Passaic County, New Jersey | 2,715.3 |
| 6 | Middlesex County, New Jersey | 2,621.6 |
| 7 | Camden County, New Jersey | 2,321.5 |
| 8 | Mercer County, New Jersey | 1,632.2 |
| 9 | Monmouth County, New Jersey | 1,344.7 |
| 10 | Somerset County, New Jersey | 1,071.7 |
| 11 | Morris County, New Jersey | 1,069.8 |
| 12 | Ocean County, New Jersey | 917 |
| 13 | Gloucester County, New Jersey | 895.3 |
| 14 | Burlington County, New Jersey | 561.9 |
| 15 | Atlantic County, New Jersey | 494.1 |
| 16 | Cape May County, New Jersey | 386.9 |
| 17 | Cumberland County, New Jersey | 324.4 |
| 18 | Warren County, New Jersey | 304.5 |
| 19 | Hunterdon County, New Jersey | 300 |
| 20 | Sussex County, New Jersey | 287.6 |
| 21 | Salem County, New Jersey | 199.1 |
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