Ranking of Connecticut Counties By Population with Unclassified Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 596.88K people in Connecticut with Unclassified ancestry. Among all Connecticut counties, Fairfield County had the highest population with Unclassified ancestry (151.52K), followed by New Haven County (136.57K), and Hartford County (134.28K).

The chart and table below shows the top 8 counties with high number of people with Unclassified 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 Population with Unclassified Ancestry in 2021
Fairfield County
New Haven County
Hartford County
New London County
Tolland County
Litchfield County
Windham County
Middlesex County
Ranking of Connecticut Counties By Population with Unclassified Ancestry in 2021
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Rank County Population
1 Fairfield County 151524
2 New Haven County 136569
3 Hartford County 134282
4 New London County 48144
5 Tolland County 37959
6 Litchfield County 37109
7 Windham County 26461
8 Middlesex County 24831