Illiopolis is located in Illinois. Illiopolis, Illinois has a population of 803. Illiopolis is more family-centric than the surrounding county with 28% households with children. The county percentage for households with children is 26%.
The median household income in Illiopolis, Illinois is $65,052. The median household income for the surrounding county is $61,490 compared to the national median of $61,963. The median age of people living in Illiopolis is 39.5 years.
The average high temperature in July is 86.18 degrees, with an average low temperature in January of 15.53 degrees. The annual precipitation is 36.94.