Beardstown is a city in Cass County, Illinois, United States. The population was 5,951 at the 2020 census. The public schools are in Beardstown Community Unit School District 15.

Cass County is a county located in the U.S. state of Illinois. As of the 2020 United States Census, the population was 13,042. Its county seat is Virginia. It is the home of the Jim Edgar Panther Creek State Fish and Wildlife Area.