RANKING · 2020 CENSUS · 21 SHOWN OF 21

Fastest growing, New Jersey counties · 2020

New Jersey counties ranked by population growth 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Hudson County, NJNJ735,033+14.3%+41%

02Ocean County, NJNJ673,746+10.5%−41%

03Essex County, NJNJ896,379+10.2%+413%

04Union County, NJNJ601,863+7.2%+24%

05Somerset County, NJNJ356,486+6.8%−72%

06Middlesex County, NJNJ883,335+6.6%−44%

07Mercer County, NJNJ399,289+5.7%−26%

08Bergen County, NJNJ977,026+5.6%−21%

09Gloucester County, NJNJ312,638+4.9%−55%

10Passaic County, NJNJ531,624+4.6%−43%

11Morris County, NJNJ524,251+3.5%−70%

12Burlington County, NJNJ481,439+2.9%−59%

13Monmouth County, NJNJ651,035+2.1%−81%

14Camden County, NJNJ535,799+1.9%+58%

15Warren County, NJNJ112,953+0.9%−93%

16Hunterdon County, NJNJ131,781+0.5%−96%

17Atlantic County, NJNJ278,657-0.0%−100%

18Cumberland County, NJNJ157,148-1.8%−129%

19Salem County, NJNJ66,280-1.9%+22%

20Cape May County, NJNJ93,390-2.1%−127%

21Sussex County, NJNJ148,063-3.4%−133%

SHOWING 1–21 OF 21

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