RANKING · 2020 CENSUS · 21 SHOWN OF 21

Largest by population, New Jersey counties · 2020

The most populous New Jersey counties as of the 2020 population estimates. 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 ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Bergen County, NJNJ955,732+8%

02Essex County, NJNJ863,728+9%

03Middlesex County, NJNJ863,162+15%

04Hudson County, NJNJ724,854+19%

05Monmouth County, NJNJ643,615+5%

06Ocean County, NJNJ637,229+25%

07Union County, NJNJ575,345+10%

08Passaic County, NJNJ524,118+7%

09Camden County, NJNJ523,485+3%

10Morris County, NJNJ509,285+8%

11Burlington County, NJNJ461,860+9%

12Mercer County, NJNJ387,340+10%

13Somerset County, NJNJ345,361+16%

14Gloucester County, NJNJ302,294+19%

15Atlantic County, NJNJ274,534+9%

16Cumberland County, NJNJ154,152+5%

17Sussex County, NJNJ144,221+0%

18Hunterdon County, NJNJ128,947+6%

19Warren County, NJNJ109,632+7%

20Cape May County, NJNJ95,263−7%

21Salem County, NJNJ64,837+1%

SHOWING 1–21 OF 21

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS