RANKING · 2025 ESTIMATES · 21 SHOWN OF 21

Most population lost, New Jersey counties

New Jersey counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 21 counties in New Jersey that qualify, ranked against each other statewide. The median across all 21 is +10,344. Biggest climber in the top 100 since 2020: Hudson County, NJ, up 11 places to #10.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲2Cape May County, NJNJ93,390-1,873−126%

02▲2Salem County, NJNJ66,280+1,443−243%

03▲3Hunterdon County, NJNJ131,781+2,834−80%

04▼2Cumberland County, NJNJ157,148+2,996−64%

05▲2Warren County, NJNJ112,953+3,321−69%

06▼5Sussex County, NJNJ148,063+3,842−71%

07▼2Atlantic County, NJNJ278,657+4,123−85%

08▲2Monmouth County, NJNJ651,035+7,420−88%

09▲6Passaic County, NJNJ531,624+7,506−79%

10▲11Hudson County, NJNJ735,033+10,179−82%

11Gloucester County, NJNJ312,638+10,344−58%

12▲2Somerset County, NJNJ356,486+11,125−81%

13Mercer County, NJNJ399,289+11,949−52%

14▼6Camden County, NJNJ535,799+12,314+102%

15▼3Morris County, NJNJ524,251+14,966−69%

16▼7Burlington County, NJNJ481,439+19,579−31%

17▲1Middlesex County, NJNJ883,335+20,173−74%

18▼1Bergen County, NJNJ977,026+21,294−64%

19▼3Union County, NJNJ601,863+26,518−8%

20Essex County, NJNJ896,379+32,651+112%

21▼2Ocean County, NJNJ673,746+36,517−53%

SHOWING 1–21 OF 21

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES