RANKING · 2020 CENSUS · 21 SHOWN OF 21

Highest Irish population share, New Jersey counties · 2020

New Jersey counties ranked by the share of all residents who are Irish ancestry (2020 American Community Survey). A concentration measure: Irish residents as a percentage of total population. This list covers the 21 counties in New Jersey that qualify, ranked against each other statewide. The median across all 21 is 17.6%.

Irish Americans: full group profile →

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SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH SHAREVS 2010

01Cape May County, NJNJ93,39030.1%−0.8 pts

02Gloucester County, NJNJ312,63826.7%−1.7 pts

03Sussex County, NJNJ148,06321.7%−5.5 pts

04Monmouth County, NJNJ651,03521.2%−2.2 pts

05Warren County, NJNJ112,95320.8%−0.3 pts

06Ocean County, NJNJ673,74620.2%−3.2 pts

07Salem County, NJNJ66,28019.8%−0.7 pts

08Hunterdon County, NJNJ131,78119.1%−4.4 pts

09Burlington County, NJNJ481,43918.8%−3.3 pts

10Camden County, NJNJ535,79918.2%−2.5 pts

11Morris County, NJNJ524,25117.6%−2.8 pts

12Atlantic County, NJNJ278,65715.6%−2.4 pts

13Somerset County, NJNJ356,48611.8%−1.6 pts

14Bergen County, NJNJ977,02611.2%−2.6 pts

15Mercer County, NJNJ399,28910.7%−2.4 pts

16Cumberland County, NJNJ157,1489.5%−0.7 pts

17Middlesex County, NJNJ883,3358.9%−2.1 pts

18Union County, NJNJ601,8637.8%−2.1 pts

19Passaic County, NJNJ531,6246.8%−2.6 pts

20Hudson County, NJNJ735,0335.8%−1.7 pts

21Essex County, NJNJ896,3795.3%−1.5 pts

SHOWING 1–21 OF 21

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