Connecticut 2020 Census Total Population By County

The total population of Connecticut from the 2020 Census was 3,605,944, based on data from the US Census Bureau.

Fairfield County was the most populated county (957,419), followed by Hartford County (899,498), and then New Haven County (864,835). On the other hand, the 3 counties that were least populated include: Windham County (116,418), Tolland County (149,788), and Middlesex County (164,245).

You can also see this information for other states and also for the US by state.

Hover over or click on the counties to see the number and percentage of Connecticut population that lives in each county. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can also see the population by county for the different racial groups as well as the different ethnicities in Connecticut.