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. The value of farms and rural land for sale in Hamilton County, Illinois, recently on Land.com was almost $1 million. This represents approximately 1,000 acres of farms and rural real estate for sale in Hamilton County. Hamilton County ranks 101st in the Prairie State for the combined amount of land currently advertised for sale. Of all locations in Hamilton County with farms, hunting land and other rural land and acreage 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 Illinois's 68th biggest county (435 square miles). It's located in the Southern Illinois region of Illinois.