Ranking of Connecticut Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on February 22, 2026.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Connecticut, Fairfield County had the highest voting-age population (18 years and over) (743.17K), followed by Hartford County (713.43K), and New Haven County (690.99K).
The chart below shows the top 8 counties with high voting-age population, and the table below shows the ranking of all Connecticut counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Connecticut Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Connecticut Counties By Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | Fairfield County | 743170 |
| 2 | Hartford County | 713425 |
| 3 | New Haven County | 690994 |
| 4 | New London County | 216922 |
| 5 | Litchfield County | 151879 |
| 6 | Middlesex County | 135983 |
| 7 | Tolland County | 123584 |
| 8 | Windham County | 93270 |
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