Ranking of Connecticut Counties By Population in 2021
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2021, the Population for Connecticut was 3.61M. Among all Connecticut counties, Capitol Planning Region had the highest population (971.94K), followed by Western Connecticut Planning Region (623.93K), and South Central Connecticut Planning Region (568.96K).
The chart below shows the top 9 counties, and the table below shows the ranking of all Connecticut counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Connecticut Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2021 Census.
See this for other years:
Ranking of Connecticut Counties By Population in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Capitol Planning Region | 971938 |
| 2 | Western Connecticut Planning Region | 623927 |
| 3 | South Central Connecticut Planning Region | 568961 |
| 4 | Naugatuck Valley Planning Region | 452095 |
| 5 | Greater Bridgeport Planning Region | 326799 |
| 6 | Southeastern Connecticut Planning Region | 278855 |
| 7 | Lower Connecticut River Valley Planning Region | 175456 |
| 8 | Northwest Hills Planning Region | 112952 |
| 9 | Northeastern Connecticut Planning Region | 95624 |