Ofallon is located in St. Charles County, MO. The population is 81,983, making Ofallon the largest city in St. Charles County and the 7th largest city in the state of Missouri.
There are 22 public schools in Ofallon with an average Homefacts rating of B+. The total crime rate for Ofallon is very low , and there are 84 registered sex offenders residing in the city. Unemployment in Ofallon is low and the median home sales price is $0. Detailed and up-to-date Ofallon property reports are available for any property address.