Jefferson County is in Southern Illinois. Of the 102 counties in the Inland Empire, 373,648-acre Jefferson County ranks 41st by size. Recent Land Network data includes almost 1,000 acres of undeveloped land for sale in Illinois's Jefferson County, which is valued at a combined $2 million. The average price of undeveloped acreage for sale in Jefferson County was $103,091. Some suggested uses for undeveloped land currently for sale in Jefferson County include for commercial, hunting/fishing, and agriculture use. Some common wildlife species to be found on undeveloped land for sale in Jefferson County include whitetail deer, turkey, deer, ducks and dove. Current commercial applications for commercial property for sale in Jefferson 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.