Knox County is in Western Illinois. Of the 102 counties in the Prairie State, 719-square-mile Knox County ranks 23rd by size. Recent listings of undeveloped land for sale in Illinois's Knox County totals about 1,000 acres and a combined market value of about $4 million. The most common type of land for sale by combined acreage in Knox County is undeveloped land. The average price of undeveloped land for sale in Knox County was $171,849. Some suggested uses for undeveloped land currently for sale in Knox County include for commercial, hunting/fishing, and agriculture use. Some common wildlife species to be found on undeveloped land for sale in Knox County include whitetail deer, turkey, deer, ducks and dove. Current commercial applications for commercial property for sale in Knox County include for commercial, hunting/fishing and agriculture use. Browse all Illinois undeveloped land for sale on the Land Network to find your next commercial property or land investment.