Connecticut Counties by Population (2025)

The most populous counties in Connecticut are Capitol Planning Region with 991,508, Western Connecticut Planning Region at 637,013, South Central Connecticut Planning Region with 576,718, Naugatuck Valley Planning Region at 462,220, and Greater Bridgeport Planning Region with 335,666. You can get the most current Census population data for all 9 Connecticut counties, sorted from the most populous counties in Connecticut to the least, according to the 2024 Population Estimates Program.

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