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 combined value of land and rural real estate for sale in McMullen County, Texas, recently on Land.com was almost $18 million. This represents nearly 5,000 acres of land and rural real estate for sale in McMullen County. McMullen County ranks 238th in the Lone Star State for the total number of acres of land currently advertised for sale. There were two properties listed as sold in McMullen County through the Land Network Comparable Sales Program. This represented a total value of $2,196,000. Tilden had 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 largest county (1,156 square miles). It's located in the Rio Grande Plains Texas region of Texas.