RANKING · 2020 CENSUS · 21 SHOWN OF 21

Most population lost, New Jersey counties · 2020

New Jersey counties that lost 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.

Flip the list · Most population gained, US counties →

New JerseyAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Sussex County, NJNJ148,063-5,044−138%

02Cumberland County, NJNJ157,148-2,746−133%

03Cape May County, NJNJ93,390-2,002−128%

04Salem County, NJNJ66,280-1,246+23%

05Atlantic County, NJNJ278,657-15−100%

06Hunterdon County, NJNJ131,781+598−96%

07Warren County, NJNJ112,953+940−91%

08Camden County, NJNJ535,799+9,828+61%

09Burlington County, NJNJ481,439+13,126−54%

10Monmouth County, NJNJ651,035+13,235−79%

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

12Morris County, NJNJ524,251+17,009−65%

13Mercer County, NJNJ399,289+20,827−16%

14Somerset County, NJNJ356,486+21,917−62%

15Passaic County, NJNJ531,624+22,892−36%

16Union County, NJNJ601,863+38,846+35%

17Bergen County, NJNJ977,026+50,616−14%

18Middlesex County, NJNJ883,335+53,304−32%

19Ocean County, NJNJ673,746+60,662−22%

20Essex County, NJNJ896,379+79,759+417%

21Hudson County, NJNJ735,033+90,588+62%

SHOWING 1–21 OF 21

Download CSV (full list, 21 rows)

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