Ranking of Connecticut Counties By Population in 2017
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2017, the Population for Connecticut was 3.58M. Among all Connecticut counties, Fairfield County had the highest population (944.11K), followed by Hartford County (893.14K), and New Haven County (857.85K).
The chart below shows the top 8 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), 2017 Census.
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Ranking of Connecticut Counties By Population in 2017
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| Rank | County | Population |
|---|---|---|
| 1 | Fairfield County | 944107 |
| 2 | Hartford County | 893141 |
| 3 | New Haven County | 857845 |
| 4 | New London County | 267829 |
| 5 | Litchfield County | 181719 |
| 6 | Middlesex County | 163058 |
| 7 | Tolland County | 151136 |
| 8 | Windham County | 116489 |
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