Marion County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 37,729. Its county seat is Salem.
Marion County Courthouse in Salem
Salem is a city in and the county seat of Marion County, Illinois, United States. The population was 7,282 at the 2020 census.
Downtown Salem, July 2019
Birthplace of William Jennings Bryan