Ranking of Connecticut 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 528.98K people in Connecticut with Irish ancestry (14.67% of Connecticut population). Among all Connecticut counties, Middlesex County had the highest percentage of its population with Irish ancestry (19.66%), followed by Litchfield County (18.69%), and New London County (17.33%).
The chart and table below shows the top 8 counties with high percentage of its population having Irish ancestry.
You can see similar information for other states and for other ancestry groups in Connecticut.
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Related Topics: Connecticut ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Connecticut Counties By Percentage of Population with Irish Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Middlesex County | 19.66 |
| 2 | Litchfield County | 18.69 |
| 3 | New London County | 17.33 |
| 4 | Tolland County | 16.78 |
| 5 | Windham County | 14.86 |
| 6 | New Haven County | 14.23 |
| 7 | Fairfield County | 13.72 |
| 8 | Hartford County | 13.19 |
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