New Jersey Counties by Population (2025)
Top 5 Most Populous Counties
21 Counties
| County | 2025 Pop. ↓ | Area (mi²) | Density | Change (2020) |
|---|---|---|---|---|
| Bergen County | 966,128 | 233 | 4,146 | 1.3% |
| Middlesex County | 868,681 | 309 | 2,811 | 0.84% |
| Essex County | 853,903 | 126 | 6,777 | -0.71% |
| Hudson County | 711,654 | 46 | 15,471 | -1.42% |
| Ocean County | 666,265 | 628 | 1,061 | 4.35% |
| Monmouth County | 639,941 | 468 | 1,367 | -0.45% |
| Union County | 577,344 | 103 | 5,605 | 0.64% |
| Camden County | 532,290 | 221 | 2,409 | 1.75% |
| Morris County | 520,831 | 461 | 1,130 | 2.44% |
| Passaic County | 512,917 | 186 | 2,758 | -2.01% |
| Burlington County | 475,299 | 799 | 595 | 2.95% |
| Mercer County | 383,455 | 224 | 1,712 | -0.78% |
| Somerset County | 352,432 | 302 | 1,167 | 2.23% |
| Gloucester County | 311,735 | 322 | 968 | 3.03% |
| Atlantic County | 274,875 | 556 | 494 | 0.25% |
| Cumberland County | 154,284 | 483 | 319 | 0.37% |
| Sussex County | 147,246 | 518 | 284 | 2.31% |
| Hunterdon County | 130,939 | 428 | 306 | 1.67% |
| Warren County | 111,950 | 357 | 314 | 2.22% |
| Cape May County | 93,020 | 252 | 369 | -2.13% |
| Salem County | 65,700 | 332 | 198 | 1.32% |
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 966,128. The most recent census shows that its population has increased by 0.01% 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 : 868,681
- Essex County : 853,903
New Jersey Counties with the Fewest Residents
The smallest county in New Jersey is Salem County, with a population of just 65,700. This total represents a increase of 0.0% since the last census count was performed.
Other small counties include:
- Cape May County : 93,020
- Warren County : 111,950
- Hunterdon County : 130,939
New Jersey Counties with Rapid Growth
Ocean County, with its sizeable population of 666,265, has shown the largest population growth, with an increase of 0.0% since the last census.
On the other hand, Cape May County has had the largest decrease in population, with its 93,020 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)