Knox County is in North Central Plains Texas. Of the 254 counties in the Lone Star State, 855-square-mile Knox County ranks 193rd by size. A recent survey of Land Network data records almost 1,000 acres of residential land and property for sale in Texas's Knox County, which is valued at a combined $2 million. The average price of residential land for sale in Knox County was $167,138. Browse all residential land and rural property for sale in Texas 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.