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 land for sale in Texas's McMullen County recently was $20 million, representing a combined 4,979 acres of land for sale in McMullen County. McMullen County ranks 234th in the Lone Star State for the total acreage of land currently advertised for sale. Of all locations in McMullen County with land for sale, Tilden featured the most land for sale. Economically speaking, McMullen County's is largely dependent on mining and mineral extraction-related businesses and services. McMullen County is the 46th largest county (1,156 square miles) in Texas. It's located in the Rio Grande Plains Texas region of the state.