McLeansboro is the county seat of Hamilton County, a mostly agricultural region comprising cornfields and small Midwestern farming communities. This often-overlooked area of southern Illinois is also home to a few surprising attractions, including the country's largest archaeological site,?Cahokia Mounds State Historic Site, over 100 wineries and outdoor recreation like bouldering and mountain biking in 280,000-acre Shawnee National Forest. A total of nearly 1,000 acres were listed for sale in Hamilton County, Illinois, recently, representing a total value of $1 million in Hamilton County farms, rural land, hunting land and other land for sale. Hamilton County ranks 101st in the state for the total acreage of land currently advertised for sale. Among cities in Hamilton County with farms and rural land for sale, Dahlgren had the most land for sale. Hamilton County has a large agricultural economy, with 695 farms recorded in the county during the latest U.S. Census. Farming activities in Hamilton County generate annual revenues of $11 million, most of which is from crops. Hamilton County is the 68th biggest county (435 square miles) in Illinois. It's located in the Southern Illinois region of Illinois.