Counties in New Jersey by population density
Hudson County had the highest population density of 21 counties in 2023, at 6,015.5 inhabitants per km². Salem County had the lowest, at 76.2 inhabitants per km². The median was 432.9 inhabitants per km² and the figure for New Jersey was 493.2 inhabitants per km². Source: the U.S. Census Bureau.
All counties, 2023
Full ranking
| Rank | Counties | 2023 | Change on 2022 |
|---|---|---|---|
| 1 | Hudson County | 6,015.5 | +1.7% |
| 2 | Essex County | 2,667.7 | +1.9% |
| 3 | Union County | 2,202.1 | +1.9% |
| 4 | Bergen County | 1,599.1 | +0.8% |
| 5 | Middlesex County | 1,090.1 | +1% |
| 6 | Passaic County | 1,087 | +1.4% |
| 7 | Camden County | 924.4 | +0.8% |
| 8 | Mercer County | 673.1 | +1.1% |
| 9 | Monmouth County | 532.6 | +0.1% |
| 10 | Somerset County | 449 | +1% |
| 11 | Morris County | 432.9 | +1% |
| 12 | Ocean County | 406.4 | +0.8% |
| 13 | Gloucester County | 370.1 | +0.6% |
| 14 | Burlington County | 228.1 | +1% |
| 15 | Atlantic County | 192.3 | +0.3% |
| 16 | Cape May County | 145.2 | -0.6% |
| 17 | Cumberland County | 123.4 | +1.6% |
| 18 | Warren County | 120.9 | +0.6% |
| 19 | Hunterdon County | 117.6 | +0.3% |
| 20 | Sussex County | 109 | +0.5% |
| 21 | Salem County | 76.2 | +0.6% |
Other periods
About this ranking
Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.
United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.
How to cite
U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
Rank Counties in New Jersey by population density using official data, and cite the source.
rank_places {"indicator":"population_density","level":"province","within":"New Jersey","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_density&level=province&within=New%20Jersey&limit=10Questions
Which county has the highest population density?
Hudson County, with 6,015.5 inhabitants per km² in 2023, according to the U.S. Census Bureau.
Which county has the lowest population density?
Salem County, with 76.2 inhabitants per km² in 2023.
Where does this ranking come from?
Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved 2026-10-09.
Population density: other rankings
- Countries
- EU countries
- US states
- EU regions (NUTS 2)
- US counties
- Autonomous communities of Spain
- Provinces of Spain
- Municipalities of Spain
- Regions of Germany (NUTS 2)
- Regions of France (NUTS 2)
- Regions of Italy (NUTS 2)
- Regions of Poland (NUTS 2)
Counties in New Jersey: more rankings
- Asian population share
- Bachelor's degree or higher, population 25 and over
- Live births, July to June
- Black or African American population share
- Crude birth rate, July to June
- Crude death rate, July to June
- Deaths, July to June
- Foreign-born population share
- Real GDP growth
- GDP per capita, US dollars
- Gross domestic product (GDP), US dollars
- Hispanic or Latino population share
- Homeownership rate (US, housing units)
- Median age
- Median gross rent (monthly)
- Median home value