RANKING · 2020 CENSUS · 14 SHOWN OF 14

Largest Irish population, Massachusetts counties · 2020

Massachusetts counties ranked by the number of residents who are Irish ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 14 counties in Massachusetts that qualify, ranked against each other statewide. The median across all 14 is 100,772.

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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 POPULATIONVS 2010

01Middlesex County, MAMA1,669,979309,773−11%

02Norfolk County, MAMA739,749179,598−15%

03Essex County, MAMA826,653158,420−8%

04Plymouth County, MAMA546,829155,515−6%

05Worcester County, MAMA888,502152,533−13%

06Suffolk County, MAMA791,891104,001−10%

07Bristol County, MAMA593,640100,772−4%

08Hampden County, MAMA464,33867,163−16%

09Barnstable County, MAMA233,53957,036−3%

10Hampshire County, MAMA164,06529,174−16%

11Berkshire County, MAMA128,22422,097−28%

12Franklin County, MAMA70,69812,981−9%

13Dukes County, MAMA21,2193,716+24%

14Nantucket County, MAMA14,7581,753−7%

SHOWING 1–14 OF 14

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