RANKING · 2024 ACS · 14 SHOWN OF 14

Highest Irish population share, Massachusetts counties

Massachusetts counties ranked by the share of all residents who are Irish ancestry (2024 American Community Survey). A concentration measure: Irish residents as a percentage of total population. This list covers the 14 counties in Massachusetts that qualify, ranked against each other statewide. The median across all 14 is 18.7%. Biggest climber in the top 100 since 2020: Nantucket County, MA, up 7 places to #5.

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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

01Plymouth County, MAMA546,82927.6%−6.2 pts

02Barnstable County, MAMA233,53925.2%−1.8 pts

03Norfolk County, MAMA739,74924.0%−7.7 pts

04Dukes County, MAMA21,21919.2%+0.7 pts

05▲7Nantucket County, MAMA14,75819.2%+0.4 pts

06▲5Berkshire County, MAMA128,22419.0%−4.5 pts

07▼2Essex County, MAMA826,65318.7%−4.6 pts

08▼2Middlesex County, MAMA1,669,97918.3%−5.2 pts

09Hampshire County, MAMA164,06517.9%−4.3 pts

10▼3Worcester County, MAMA888,50217.1%−5.1 pts

11▼3Franklin County, MAMA70,69816.9%−3.0 pts

12▼2Bristol County, MAMA593,64016.8%−2.5 pts

13Hampden County, MAMA464,33813.0%−4.3 pts

14Suffolk County, MAMA791,89112.5%−4.0 pts

SHOWING 1–14 OF 14

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES