Connecticut Citizen Population By County in 2021 (ACS-5Yrs)

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Connecticut was 3,359,990 and represented 93.20% of the total Connecticut population.

Among all Connecticut counties, Fairfield had the highest citizen population (849.98K), followed by Hartford (841.48K), and New Haven (810.92K).

In terms of percentages, Windham had the highest percentage of its population being citizens (97.43%), followed by Middlesex (97.17%), and Litchfield (96.86%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

You can see similar information for other states and by state for the United States.