Mercer County is in Western Illinois. Of the 102 counties in the Inland Empire, 568-square-mile Mercer County ranks 44th by size. Mercer County, Illinois, has approximately 1,000 acres of undeveloped land for sale based on recent Land Network data. The combined market value of land for sale here was about $3 million. The average price of undeveloped acreage for sale in Mercer County was $1 million. Some suggested uses for undeveloped land currently for sale in Mercer County include for commercial, hunting/fishing, and agriculture use. Some common wildlife species to be found on undeveloped land for sale in Mercer County include whitetail deer, turkey, deer, dove, quail and ducks. Current commercial applications for commercial property for sale in Mercer County include for commercial, hunting/fishing and agriculture use. Browse all Illinois undeveloped acreage for sale on the Land Network to find your next commercial property or land investment.