RANKING · 2010 CENSUS · 21 SHOWN OF 21

Youngest by median age, New Jersey counties · 2010

New Jersey counties with the youngest median age (2010 ACS). This list covers the 21 counties in New Jersey that qualify, ranked against each other statewide. The median across all 21 is 40.2.

Flip the list · Oldest by median age, US counties →

New JerseyAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Hudson County, NJNJ735,03334.2+2%

02Passaic County, NJNJ531,62436.1+4%

03Essex County, NJNJ896,37936.4+5%

04Cumberland County, NJNJ157,14836.5+3%

05Middlesex County, NJNJ883,33537.2+4%

06Mercer County, NJNJ399,28937.8+5%

07Camden County, NJNJ535,79937.9+6%

08Union County, NJNJ601,86338.0+4%

09Gloucester County, NJNJ312,63838.7+7%

10Atlantic County, NJNJ278,65739.9+8%

11Somerset County, NJNJ356,48640.2+8%

12Burlington County, NJNJ481,43940.4+9%

13Salem County, NJNJ66,28040.8+7%

14Bergen County, NJNJ977,02641.1+5%

15Monmouth County, NJNJ651,03541.3+10%

16Morris County, NJNJ524,25141.3+9%

17Warren County, NJNJ112,95341.5+10%

18Sussex County, NJNJ148,06341.8+13%

19Ocean County, NJNJ673,74642.6+4%

20Hunterdon County, NJNJ131,78143.5+12%

21Cape May County, NJNJ93,39047.1+11%

SHOWING 1–21 OF 21

Download CSV (full list, 21 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS