Carterville is a city in Williamson County, Illinois, in the United States, and is geographically situated between Carbondale, Illinois and Marion, Illinois. The city is located next to Crab Orchard National Wildlife Refuge. The Refuge's 44,000 acres (180 km2) of land and water contain a wide diversity of flora and fauna . The city is part of the Carbondale-Marion combined statistical area and city has grown considerably as a residential community of Marion.