Knox County is in North Central Plains Texas. Of the 254 counties in the Lone Star State, Knox County is 193rd in terms of its size (547,507 acres). Knox County, Texas, has approximately 1,000 acres of residential land for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was about $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.