| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Union County | 1 | 5.68% | 606,240 | 573,680 |
| Ocean County | 2 | 5.3% | 672,423 | 638,554 |
| Somerset County | 3 | 5.24% | 362,839 | 344,788 |
| Middlesex County | 4 | 4.95% | 904,119 | 861,460 |
| Essex County | 5 | 4.5% | 898,744 | 860,020 |
| Burlington County | 6 | 4.07% | 480,469 | 461,694 |
| Hudson County | 7 | 4.04% | 751,050 | 721,909 |
| Gloucester County | 8 | 4.02% | 314,726 | 302,575 |
| Morris County | 9 | 3.91% | 528,368 | 508,472 |
| Bergen County | 10 | 3.89% | 990,798 | 953,711 |
| Sussex County | 11 | 3.25% | 148,594 | 143,919 |
| Hunterdon County | 12 | 3.1% | 132,783 | 128,793 |
| Mercer County | 13 | 2.97% | 397,980 | 386,492 |
| Warren County | 14 | 2.92% | 112,718 | 109,520 |
| Camden County | 15 | 2.91% | 538,400 | 523,151 |
| Cumberland County | 16 | 2.79% | 158,018 | 153,724 |
| Atlantic County | 17 | 2.59% | 281,291 | 274,196 |
| Salem County | 18 | 2.28% | 66,319 | 64,843 |
| Passaic County | 19 | 1.82% | 532,975 | 523,464 |
| Monmouth County | 20 | 1.14% | 650,099 | 642,778 |
| Cape May County | 21 | -2.05% | 93,107 | 95,051 |
New Jersey's counties show varied growth patterns from 2020 to 2025. Union County leads with 5.68% annualized growth, followed by Ocean County (5.3%) and Somerset County (5.24%). The largest counties are Bergen County (990,798), Middlesex County (904,119), and Essex County (898,744). Of the 21 counties in New Jersey, 20 are growing while just 1 has experienced population decline. Overall, counties averaged 3.3% annualized growth, with total population growing by 3.77% annually.
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