South Texas is typically classified as the area between the San Antonio metro area and south to the Rio Grande and Gulf of Mexico. The value of all ranches, farms, hunting land and other rural land and acreage for sale in Texas's McMullen County recently was $20 million, representing a total of 5,019 acres of land for sale in McMullen County. McMullen County ranks 232nd in the Lone Star State for the total acreage of land currently advertised for sale. Of all land for sale in McMullen County, Tilden featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Texas. McMullen County is Texas's 46th biggest county (1,156 square miles). It's located in the Rio Grande Plains Texas region of the state.