
Collinsville
- County Seat:
- No
- Area (mi²):
- 3.134
- State:
- Connecticut
Collinsville is a CDP located in . Collinsville has a 2025 population of 3,751. Collinsville is currently declining at a rate of 0% annually and its population has increased by 0.59% since the most recent census, which recorded a population of 3,729 in 2020.
The average household income in Collinsville is $180,684 with a poverty rate of 6.62%. The median age in Collinsville is 46.1 years: 41.1 years for males, and 50.3 years for females.