| Rank | County | Population (2012) |
|---|---|---|
| 1 | Bergen County, New Jersey | 918,888 |
| 2 | Middlesex County, New Jersey | 823,041 |
| 3 | Essex County, New Jersey | 787,744 |
| 4 | Hudson County, New Jersey | 652,302 |
| 5 | Monmouth County, New Jersey | 629,384 |
| 6 | Ocean County, New Jersey | 580,470 |
| 7 | Union County, New Jersey | 543,976 |
| 8 | Camden County, New Jersey | 513,539 |
| 9 | Passaic County, New Jersey | 502,885 |
| 10 | Morris County, New Jersey | 497,999 |
| 11 | Burlington County, New Jersey | 451,336 |
| 12 | Mercer County, New Jersey | 368,303 |
| 13 | Somerset County, New Jersey | 327,707 |
| 14 | Gloucester County, New Jersey | 289,586 |
| 15 | Atlantic County, New Jersey | 275,422 |
| 16 | Cumberland County, New Jersey | 157,785 |
| 17 | Sussex County, New Jersey | 147,442 |
| 18 | Hunterdon County, New Jersey | 127,050 |
| 19 | Warren County, New Jersey | 107,653 |
| 20 | Cape May County, New Jersey | 96,304 |
| 21 | Salem County, New Jersey | 65,774 |
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