Connecticut Counties by Population (2026)
by Kristen Carney
Updated: February 9, 2026
The most populous counties in Connecticut are Capitol Planning Region with 977,290, Western Connecticut Planning Region at 627,071, South Central Connecticut Planning Region with 570,598, Naugatuck Valley Planning Region at 454,969, and Greater Bridgeport Planning Region with 329,259. 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 American Community Survey.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Connecticut counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | Capitol Planning Region | 977,290 |
| 2 | Western Connecticut Planning Region | 627,071 |
| 3 | South Central Connecticut Planning Region | 570,598 |
| 4 | Naugatuck Valley Planning Region | 454,969 |
| 5 | Greater Bridgeport Planning Region | 329,259 |
| 6 | Southeastern Connecticut Planning Region | 279,971 |
| 7 | Lower Connecticut River Valley Planning Region | 175,822 |
| 8 | Northwest Hills Planning Region | 113,216 |
| 9 | Northeastern Connecticut Planning Region | 96,312 |
|
United States Census Bureau. B01001 SEX BY AGE, 2024 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. January 29, 2026. http://www.census.gov/. |
||
Email Me When New Data Are Released
Join thousands of subscribers and receive just 2 (TWO!) emails a year in March and December when the US Census Bureau releases new population data for Connecticut counties.
Products & Services
Plumbing
Connect
- 1-800-939-2130
- Contact Us
© Copyright 2026 Cubit Planning, Inc.