RANKING · 2025 ESTIMATES · 21 SHOWN OF 21

Most sparsely populated, New Jersey counties

New Jersey counties with the fewest residents per square mile (2025). This list covers the 21 counties in New Jersey that qualify, ranked against each other statewide.

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

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Salem County, NJNJ66,280200–

02Sussex County, NJNJ148,063286–

03Hunterdon County, NJNJ131,781308–

04Warren County, NJNJ112,953317–

05Cumberland County, NJNJ157,148325–

06Cape May County, NJNJ93,390371–

07Atlantic County, NJNJ278,657502–

08Burlington County, NJNJ481,439602–

09Gloucester County, NJNJ312,638971–

10Ocean County, NJNJ673,7461,072–

11Morris County, NJNJ524,2511,137–

12Somerset County, NJNJ356,4861,181–

13Monmouth County, NJNJ651,0351,390–

14Mercer County, NJNJ399,2891,779–

15Camden County, NJNJ535,7992,420–

16Passaic County, NJNJ531,6242,856–

17Middlesex County, NJNJ883,3352,856–

18Bergen County, NJNJ977,0264,197–

19Union County, NJNJ601,8635,857–

20Essex County, NJNJ896,3797,109–

21Hudson County, NJNJ735,03315,912–

SHOWING 1–21 OF 21

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES