
Collinsville township
- County:
- Madison County
- County Seat:
- No
- Area (mi²):
- 34.854
- State:
- Illinois
Collinsville township is located in Madison County, Illinois. Collinsville township has a 2025 population of 34,902. Collinsville township is currently declining at a rate of -0.39% annually and its population has decreased by -1.96% since the most recent census, which recorded a population of 35,598 in 2020.
The average household income in Collinsville township is $99,229 with a poverty rate of 10.53%. The median age in Collinsville township is 42.4 years: 40.8 years for males, and 44.2 years for females.