Knox County is in Northeast Missouri. Of the 115 counties in the state, Knox County ranks 83rd in terms of size (506 square miles). Recent Land Network data totals about 1,000 acres of residential land for sale in Missouri's Knox County, which is valued at a combined $1 million. The average price of residential land for sale in Knox County was $259,975. The county has a rural, farm-based economy. 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.