Ranking of Connecticut Counties By Percentage of Population with Celtic Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 499 people in Connecticut with Celtic ancestry (0.01% of Connecticut population). Among all Connecticut counties, Litchfield County had the highest percentage of its population with Celtic ancestry (0.04%), followed by New London County (0.03%), and Fairfield County (0.02%).

The chart and table below shows the top 8 counties with high percentage of its population having Celtic ancestry.

You can see similar information for other states and for other ancestry groups in Connecticut.

Data Source: US Census Bureau.
Ranking of Connecticut Counties By Percentage of Population with Celtic Ancestry in 2021
Litchfield County
New London County
Fairfield County
Windham County
Hartford County
Middlesex County
New Haven County
Tolland County
Ranking of Connecticut Counties By Percentage of Population with Celtic Ancestry in 2021
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Rank County Percentage of Pop. (%)
1 Litchfield County 0.04
2 New London County 0.03
3 Fairfield County 0.02
3 Windham County 0.02
4 Hartford County 0.01
4 Middlesex County 0.01
4 New Haven County 0.01
4 Tolland County 0.01