RANKING · 2020 CENSUS · 21 SHOWN OF 21

Fastest shrinking, New Jersey counties · 2020

New Jersey counties with the steepest population decline from the 2010 census to 2020. 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 population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Sussex County, NJNJ148,063-3.4%−13.5 pts

02Cape May County, NJNJ93,390-2.1%−9.7 pts

03Salem County, NJNJ66,280-1.9%−0.3 pts

04Cumberland County, NJNJ157,148-1.8%−7.8 pts

05Atlantic County, NJNJ278,657-0.0%−12.6 pts

06Hunterdon County, NJNJ131,781+0.5%−12.7 pts

07Warren County, NJNJ112,953+0.9%−11.0 pts

08Camden County, NJNJ535,799+1.9%+0.7 pts

09Monmouth County, NJNJ651,035+2.1%−9.1 pts

10Burlington County, NJNJ481,439+2.9%−4.2 pts

11Morris County, NJNJ524,251+3.5%−8.1 pts

12Passaic County, NJNJ531,624+4.6%−3.4 pts

13Gloucester County, NJNJ312,638+4.9%−5.8 pts

14Bergen County, NJNJ977,026+5.6%−1.5 pts

15Mercer County, NJNJ399,289+5.7%−2.0 pts

16Middlesex County, NJNJ883,335+6.6%−5.1 pts

17Somerset County, NJNJ356,486+6.8%−17.0 pts

18Union County, NJNJ601,863+7.2%+1.4 pts

19Essex County, NJNJ896,379+10.2%+8.2 pts

20Ocean County, NJNJ673,746+10.5%−7.4 pts

21Hudson County, NJNJ735,033+14.3%+4.2 pts

SHOWING 1–21 OF 21

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS