Caseyville Township, St. Clair County, Illinois
# Caseyville Township, St. Clair County, Illinois

Caseyville Township is located in St. Clair County, Illinois, United States. As of the 2010 census, its population was 31,996 and it contained 14,054 housing units.

## Geography

According to the 2010 census, the township has a total area of 35.11 square miles (90.9 $km^2),$ of which 34.87 square miles (90.3 $km^2)$ (or 99.32%) is land and 0.23 square miles (0.60 $km^2)$ (or 0.66%) is water.

