Marion County, Illinois
Marion County is a county located in the U.S. state of Illinois, in the southern half of the state known as "Little Egypt". According to the 2020 census, it had a population of 37,729. Its county seat is Salem. Marion County comprises the Centralia, IL Micropolitan Statistical Area, which is included in the St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area.