RANKING · 2020 CENSUS · 21 SHOWN OF 21

Most population gained, New Jersey counties · 2020

New Jersey counties that added the most residents from the 2010 census to 2020, by raw count of people rather than percentage. 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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Hudson County, NJNJ735,033+90,588+62%

02Essex County, NJNJ896,379+79,759+417%

03Ocean County, NJNJ673,746+60,662−22%

04Middlesex County, NJNJ883,335+53,304−32%

05Bergen County, NJNJ977,026+50,616−14%

06Union County, NJNJ601,863+38,846+35%

07Passaic County, NJNJ531,624+22,892−36%

08Somerset County, NJNJ356,486+21,917−62%

09Mercer County, NJNJ399,289+20,827−16%

10Morris County, NJNJ524,251+17,009−65%

11Gloucester County, NJNJ312,638+14,006−43%

12Monmouth County, NJNJ651,035+13,235−79%

13Burlington County, NJNJ481,439+13,126−54%

14Camden County, NJNJ535,799+9,828+61%

15Warren County, NJNJ112,953+940−91%

16Hunterdon County, NJNJ131,781+598−96%

17Atlantic County, NJNJ278,657-15−100%

18Salem County, NJNJ66,280-1,246+23%

19Cape May County, NJNJ93,390-2,002−128%

20Cumberland County, NJNJ157,148-2,746−133%

21Sussex County, NJNJ148,063-5,044−138%

SHOWING 1–21 OF 21

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