St. Clair County, IL
St. Clair County, Illinois abuts the Mississippi River, and is on the state’s border with Missouri. It has a population of roughly 261,000, and its county seat is the city of Belleville. Other noteworthy communities within the county include East St. Louis, Caseyville, Centreville (which was a city in St. Clair County until May, 2021, […]