The overall value of land for sale in Knox County recently on Land.com was around $42 million. This represents nearly 5,000 acres of ranches, farms, hunting land and other rural land and acreage for sale in Knox County. Knox County ranks 45th out of 120 counties in the state for the combined amount of land currently advertised for sale. Of all land for sale in Knox County, Corbin had the most land for sale. Knox County is Kentucky's 37th largest county (387 square miles). It's located in the Eastern Kentucky region of the state.