New Jersey Counties by Population (2025)
2025 Pop.
100K
200K
300K
400K
500K
600K
700K
800K
900K
Top 5 Most Populous Counties
990,798
904,119
898,744
751,050
672,423
21 Counties
| County | 2025 Pop. ↓ | Area (mi²) | Density | Change (2020) |
|---|---|---|---|---|
| Bergen County | 990,798 | 233 | 4,252 | 3.89% |
| Middlesex County | 904,119 | 309 | 2,926 | 4.95% |
| Essex County | 898,744 | 126 | 7,133 | 4.5% |
| Hudson County | 751,050 | 46 | 16,327 | 4.04% |
| Ocean County | 672,423 | 628 | 1,071 | 5.3% |
| Monmouth County | 650,099 | 468 | 1,389 | 1.14% |
| Union County | 606,240 | 103 | 5,886 | 5.68% |
| Camden County | 538,400 | 221 | 2,436 | 2.91% |
| Passaic County | 532,975 | 186 | 2,865 | 1.82% |
| Morris County | 528,368 | 461 | 1,146 | 3.91% |
| Burlington County | 480,469 | 799 | 601 | 4.07% |
| Mercer County | 397,980 | 224 | 1,777 | 2.97% |
| Somerset County | 362,839 | 302 | 1,201 | 5.24% |
| Gloucester County | 314,726 | 322 | 977 | 4.02% |
| Atlantic County | 281,291 | 556 | 506 | 2.59% |
| Cumberland County | 158,018 | 483 | 327 | 2.79% |
| Sussex County | 148,594 | 518 | 287 | 3.25% |
| Hunterdon County | 132,783 | 428 | 310 | 3.1% |
| Warren County | 112,718 | 357 | 316 | 2.92% |
| Cape May County | 93,107 | 252 | 369 | -2.05% |
| Salem County | 66,319 | 332 | 200 | 2.28% |
Overview of New Jersey Counties
There are 21 counties in New Jersey.
Bergen County is the largest county in the state, with a population of 990,798. The most recent census shows that its population has increased by 0.04% since the previous census.
A number of other New Jersey counties also boast relatively large populations for their state, though not able to match the density of Bergen County:
- Middlesex County : 904,119
- Essex County : 898,744
New Jersey Counties with the Fewest Residents
The smallest county in New Jersey is Salem County , with a population of just 66,319. This total represents a increase of 0.0% since the last census count was performed.
Other small counties include:
- Cape May County : 93,107
- Warren County : 112,718
- Hunterdon County : 132,783
New Jersey Counties with Rapid Growth
Union County , with its sizeable population of 606,240, has shown the largest population growth, with an increase of 0.1% since the last census.
On the other hand, Cape May County has had the largest decrease in population, with its 93,107 current residents totalling 0.0% less than the previous census.
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)