Ranking of Connecticut 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 528.98K people in Connecticut with Irish ancestry. Among all Connecticut counties, Fairfield County had the highest population with Irish ancestry (131.24K), followed by New Haven County (123.08K), and Hartford County (118.56K).
The chart and table below shows the top 8 counties with high number of people with 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 Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Fairfield County | 131244 |
| 2 | New Haven County | 123080 |
| 3 | Hartford County | 118564 |
| 4 | New London County | 46637 |
| 5 | Litchfield County | 34607 |
| 6 | Middlesex County | 32353 |
| 7 | Tolland County | 25188 |
| 8 | Windham County | 17310 |
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