
Plainville
- County:
- Capitol Planning Region
- County Seat:
- No
- Area (mi²):
- 9.707
- State:
- Connecticut
Plainville is located in Capitol Planning Region, Connecticut. Plainville has a 2025 population of 17,587. Plainville is currently growing at a rate of 0.27% annually and its population has increased by 0.77% since the most recent census, which recorded a population of 17,452 in 2020.
The average household income in Plainville is $102,145 with a poverty rate of 7.17%. The median age in Plainville is 42.9 years: 40.9 years for males, and 44.9 years for females.