Connecticut Population By County (2018)
Created on February 23, 2020.
Data Updated on April 4, 2021.

According to the US Census Bureau population estimates, there were 3,571,520 people living in Connecticut in 2018. Fairfield County was the most populated county with 943,971 residents, followed by Hartford County with 892,580 residents, and New Haven County with 856,971 residents. Windham County with a population of 117,059 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)
Table of Connecticut Population By County (2018)
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County Population % of State Population
Fairfield 943,971 26.43%
Hartford 892,580 24.99%
Litchfield 181,095 5.07%
Middlesex 162,870 4.56%
New Haven 856,971 24.00%
New London 266,285 7.46%
Tolland 150,689 4.22%
Windham 117,059 3.28%