Connecticut Population By County in 2018
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 3,574,561 people living in Connecticut in 2018. Fairfield County was the most populated county with 945,511 residents, followed by Hartford County with 892,767 residents, and New Haven County with 856,895 residents. Windham County with a population of 117,182 was the least populated county in Connecticut in 2018.

Use the map below to interactively explore the population of each county in Connecticut in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
Connecticut Population By County (2018)
See also Population estimate for other years:
Table of Connecticut Population By County in 2018
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County Population % of State Population
Fairfield 945,511 26.45%
Hartford 892,767 24.98%
Litchfield 181,151 5.07%
Middlesex 163,053 4.56%
New Haven 856,895 23.97%
New London 267,089 7.47%
Tolland 150,913 4.22%
Windham 117,182 3.28%