Collinsville is located in Illinois. Collinsville, Illinois has a population of 24,702. Collinsville is less family-centric than the surrounding county with 25% households with children. The county percentage for households with children is 28%.
The median household income in Collinsville, Illinois is $55,985. The median household income for the surrounding county is $63,321 compared to the national median of $66,222. The median age of people living in Collinsville is 39.2 years.
The average high temperature in July is 88.1 degrees, with an average low temperature in January of 19.4 degrees. The annual precipitation is 40.21.