Randolph County, Illinois, is located in the southwestern part of the state, bordered by the Mississippi River to the west. Established in 1813, it is one of the oldest counties in Illinois and covers an area of approximately 1,200 square miles. The county seat is Chester, known for its historic sites and vibrant community. The county is characterized by its diverse landscape, including rolling hills, forests, and farmland. It is home to several small towns and communities, with a population that values agriculture and outdoor activities. Randolph County also features attractions like Fort de Chartres, a historic French fort from the 18th century.