Connecticut Counties by Population (2025)

The most populous counties in Connecticut are Capitol Planning Region with 975,328, Western Connecticut Planning Region at 623,907, South Central Connecticut Planning Region with 568,158, Naugatuck Valley Planning Region at 456,128, and Greater Bridgeport Planning Region with 327,651. 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 2023 Population Estimates Program.

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