Connecticut 2015 Population By County
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 3,587,122 people living in Connecticut in 2015. Fairfield County was the most populated county with 944,943 residents, followed by Hartford County with 896,290 residents, and New Haven County with 860,186 residents. Windham County with a population of 116,487 was the least populated county in Connecticut in 2015.

Use the map below to interactively explore the population of each county in Connecticut in 2015. The data can also be explored further by sorting and filtering with the table below.

Connecticut 2015 Population By County
See also Population estimate for other years:
Table of Connecticut 2015 Population By County
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County Population % of State Population
Fairfield 944,943 26.34%
Hartford 896,290 24.99%
Litchfield 184,122 5.13%
Middlesex 163,724 4.56%
New Haven 860,186 23.98%
New London 269,636 7.52%
Tolland 151,734 4.23%
Windham 116,487 3.25%