Data / Rankings / Population density / Counties in New Jersey

Counties in New Jersey by population density

Hudson County had the highest population density of 21 counties in 2022, at 5,915.7 inhabitants per km². Salem County had the lowest, at 75.8 inhabitants per km². The median was 428.7 inhabitants per km² and the figure for New Jersey was 488.1 inhabitants per km². Source: the U.S. Census Bureau.

Highest5,915.7Hudson County
Lowest75.8Salem County
Median428.721 counties
New Jersey488.1History

All counties, 2022

CSVChart (SVG)

Hudson CountyHudson County: 5,915.7 inhabitants per km²5,915.7Essex CountyEssex County: 2,619.2 inhabitants per km²2,619.2Union CountyUnion County: 2,160.1 inhabitants per km²2,160.1Bergen CountyBergen County: 1,586 inhabitants per km²1,586Middlesex CountyMiddlesex County: 1,079.2 inhabitants per km²1,079.2Passaic CountyPassaic County: 1,072.3 inhabitants per km²1,072.3Camden CountyCamden County: 917.2 inhabitants per km²917.2Mercer CountyMercer County: 665.7 inhabitants per km²665.7Monmouth CountyMonmouth County: 531.9 inhabitants per km²531.9Somerset CountySomerset County: 444.6 inhabitants per km²444.6Morris CountyMorris County: 428.7 inhabitants per km²428.7Ocean CountyOcean County: 403.2 inhabitants per km²403.2Gloucester CountyGloucester County: 367.8 inhabitants per km²367.8Burlington CountyBurlington County: 226 inhabitants per km²226Atlantic CountyAtlantic County: 191.7 inhabitants per km²191.7Cape May CountyCape May County: 146.1 inhabitants per km²146.1Cumberland CountyCumberland County: 121.4 inhabitants per km²121.4Warren CountyWarren County: 120.2 inhabitants per km²120.2Hunterdon CountyHunterdon County: 117.2 inhabitants per km²117.2Sussex CountySussex County: 108.5 inhabitants per km²108.5Salem CountySalem County: 75.8 inhabitants per km²75.8
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2022
inhabitants per km²		Change on 2021
1Hudson County5,915.7+0.6%
2Essex County2,619.2+0.1%
3Union County2,160.1+0.4%
4Bergen County1,586+0.1%
5Middlesex County1,079.2+0.3%
6Passaic County1,072.3-0.2%
7Camden County917.2+0.3%
8Mercer County665.7+1.3%
9Monmouth County531.9-0.1%
10Somerset County444.6+0.4%
11Morris County428.7+0.3%
12Ocean County403.2+1%
13Gloucester County367.8+0.7%
14Burlington County226+0.7%
15Atlantic County191.7+0.4%
16Cape May County146.1-0.5%
17Cumberland County121.4-0.1%
18Warren County120.2+0.4%
19Hunterdon County117.2+0.1%
20Sussex County108.5-0%
21Salem County75.8+0.3%

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.

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Questions

Which county has the highest population density?

Hudson County, with 5,915.7 inhabitants per km² in 2022, according to the U.S. Census Bureau.

Which county has the lowest population density?

Salem County, with 75.8 inhabitants per km² in 2022.

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

Counties in New Jersey: more rankings