RANKING · 1990 CENSUS · 21 SHOWN OF 21

Most densely populated, New Jersey counties · 1990

New Jersey counties ranked by residents per square mile (2023). This list covers the 21 counties in New Jersey that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Hudson County, NJNJ735,03311,973−9%

02Essex County, NJNJ896,3796,172−2%

03Union County, NJNJ601,8634,805−5%

04Bergen County, NJNJ977,0263,546−7%

05Passaic County, NJNJ531,6242,434−7%

06Camden County, NJNJ535,7992,272−1%

07Middlesex County, NJNJ883,3352,172−10%

08Mercer County, NJNJ399,2891,451−7%

09Monmouth County, NJNJ651,0351,181−10%

10Morris County, NJNJ524,251914−10%

11Somerset County, NJNJ356,486796−19%

12Gloucester County, NJNJ312,638715−10%

13Ocean County, NJNJ673,746689−15%

14Burlington County, NJNJ481,439494−7%

15Atlantic County, NJNJ278,657404−11%

16Cape May County, NJNJ93,390378−7%

17Cumberland County, NJNJ157,148286−6%

18Warren County, NJNJ112,953257−11%

19Sussex County, NJNJ148,063253−9%

20Hunterdon County, NJNJ131,781252−12%

21Salem County, NJNJ66,280197+2%

SHOWING 1–21 OF 21

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES