RANKING · 2020 CENSUS · 21 SHOWN OF 21

Fastest shrinking, New Jersey counties

New Jersey counties with the steepest population decline since the prior decennial census. 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 Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Sussex County, NJNJ148,063-3.4%−133%

02Cape May County, NJNJ93,390-2.1%−127%

03Salem County, NJNJ66,280-1.9%+22%

04Cumberland County, NJNJ157,148-1.8%−129%

05Atlantic County, NJNJ278,657-0.0%−100%

06Hunterdon County, NJNJ131,781+0.5%−96%

07Warren County, NJNJ112,953+0.9%−93%

08Camden County, NJNJ535,799+1.9%+58%

09Monmouth County, NJNJ651,035+2.1%−81%

10Burlington County, NJNJ481,439+2.9%−59%

11Morris County, NJNJ524,251+3.5%−70%

12Passaic County, NJNJ531,624+4.6%−43%

13Gloucester County, NJNJ312,638+4.9%−55%

14Bergen County, NJNJ977,026+5.6%−21%

15Mercer County, NJNJ399,289+5.7%−26%

16Middlesex County, NJNJ883,335+6.6%−44%

17Somerset County, NJNJ356,486+6.8%−72%

18Union County, NJNJ601,863+7.2%+24%

19Essex County, NJNJ896,379+10.2%+413%

20Ocean County, NJNJ673,746+10.5%−41%

21Hudson County, NJNJ735,033+14.3%+41%

SHOWING 1–21 OF 21

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