RANKING · 2020 CENSUS · 21 SHOWN OF 21

Most densely populated, New Jersey counties · 2020

New Jersey counties ranked by residents per square mile (2020). This list covers the 21 counties in New Jersey that qualify, ranked against each other statewide. The median across all 21 is 1,105.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Hudson County, NJNJ735,03315,692+19%

02Essex County, NJNJ896,3796,850+9%

03Union County, NJNJ601,8635,599+10%

04Bergen County, NJNJ977,0264,106+8%

05Passaic County, NJNJ531,6242,816+7%

06Middlesex County, NJNJ883,3352,791+15%

07Camden County, NJNJ535,7992,365+3%

08Mercer County, NJNJ399,2891,726+10%

09Monmouth County, NJNJ651,0351,375+5%

10Somerset County, NJNJ356,4861,144+16%

11Morris County, NJNJ524,2511,105+8%

12Ocean County, NJNJ673,7461,014+25%

13Gloucester County, NJNJ312,638939+19%

14Burlington County, NJNJ481,439578+9%

15Atlantic County, NJNJ278,657494+9%

16Cape May County, NJNJ93,390379−7%

17Cumberland County, NJNJ157,148319+5%

18Warren County, NJNJ112,953307+7%

19Hunterdon County, NJNJ131,781301+6%

20Sussex County, NJNJ148,0632780%

21Salem County, NJNJ66,280195+1%

SHOWING 1–21 OF 21

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS