Ranking of Massachusetts Counties By 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. Among all Massachusetts counties, Middlesex County had the highest population with Irish ancestry (307.17K), followed by Norfolk County (179.80K), and Essex County (154.75K).
The chart and table below shows the top 10 counties with high number of people with 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 Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Middlesex County | 307172 |
| 2 | Norfolk County | 179801 |
| 3 | Essex County | 154754 |
| 4 | Plymouth County | 154557 |
| 5 | Worcester County | 153771 |
| 6 | Bristol County | 101489 |
| 7 | Suffolk County | 99023 |
| 8 | Hampden County | 64673 |
| 9 | Barnstable County | 59001 |
| 10 | Hampshire County | 28731 |
| 11 | Berkshire County | 23018 |
| 12 | Franklin County | 12868 |
| 13 | Dukes County | 3796 |
| 14 | Nantucket County | 2565 |
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