Connecticut Population By County in 2021

Based on the US Census Vintage data estimates, in 2021, the population of Connecticut was 3,606,607. Among all Connecticut counties, Capitol Planning Region had the highest population (971,938), followed by Western Connecticut Planning Region (623,927), and South Central Connecticut Planning Region (568,961). Northeastern Connecticut Planning Region was the least populated county (95,624).

Hover over or click on the counties in the map below to see the populations. 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 see similar information for other states and by state for the United States.