Ranking of Massachusetts Counties By Percentage of Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.35M people in Massachusetts with Irish ancestry (19.24% of Massachusetts population). Among all Massachusetts counties, Plymouth County had the highest percentage of its population with Irish ancestry (29.29%), followed by Barnstable County (25.88%), and Norfolk County (24.96%).
The chart and table below shows the top 10 counties with high percentage of its population having Irish ancestry.
You can see similar information for other states and for other ancestry groups in Massachusetts.
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Related Topics: Massachusetts ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Massachusetts Counties By Percentage of Population with Irish Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Plymouth County | 29.29 |
| 2 | Barnstable County | 25.88 |
| 3 | Norfolk County | 24.96 |
| 4 | Essex County | 19.23 |
| 5 | Middlesex County | 18.92 |
| 6 | Dukes County | 18.72 |
| 7 | Nantucket County | 18.59 |
| 8 | Franklin County | 18.10 |
| 9 | Worcester County | 17.95 |
| 10 | Berkshire County | 17.83 |
| 11 | Hampshire County | 17.76 |
| 12 | Bristol County | 17.62 |
| 13 | Hampden County | 13.87 |
| 14 | Suffolk County | 12.49 |