Knox County is in Northeast Missouri. Of the 115 counties in the Gateway State, Knox County is 83rd in terms of its size (506 square miles). A recent survey of Land Network data totals around 1,000 acres of residential land for sale in Missouri's Knox County, which is valued at a combined $2 million. The average price of residential land for sale in Knox County was $380,716. The economy here is principally agricultural. Browse all residential land and rural property for sale in Missouri to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.