Ofallon is located in St. Clair County, IL. The population is 28,921, making Ofallon the 2nd largest city in St. Clair County.
There are 10 public schools in Ofallon with an average Homefacts rating of A. The total crime rate for Ofallon is low , and there are 0 registered sex offenders residing in the city. Unemployment in Ofallon is moderate and the median home sales price is $0. Detailed and up-to-date Ofallon property reports are available for any property address.
Cities near Ofallon include Shiloh, OFallon Township and Caseyville Township.