Ranking of Connecticut Counties By Percentage of Population with Scotch Irish Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 17.28K people in Connecticut with Scotch Irish ancestry (0.48% of Connecticut population). Among all Connecticut counties, New London County had the highest percentage of its population with Scotch Irish ancestry (0.83%), followed by Middlesex County (0.81%), and Windham County (0.65%).

The chart and table below shows the top 8 counties with high percentage of its population having Scotch Irish 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 Scotch Irish Ancestry in 2021
New London County
Middlesex County
Windham County
Litchfield County
Fairfield County
Tolland County
Hartford County
New Haven County
Ranking of Connecticut Counties By Percentage of Population with Scotch Irish Ancestry in 2021
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Rank County Percentage of Pop. (%)
1 New London County 0.83
2 Middlesex County 0.81
3 Windham County 0.65
4 Litchfield County 0.53
5 Fairfield County 0.51
6 Tolland County 0.50
7 Hartford County 0.38
8 New Haven County 0.34