South Texas is typically classified as the area between the San Antonio metro area and south to the Rio Grande and Gulf of Mexico. Land for sale in Hidalgo County recently totaled $711 million and nearly 100,000 acres. Hidalgo County ranks 19th out of 254 counties in the Lone Star State for the total acreage of land currently advertised for sale. Among cities in Hidalgo County with farms and ranches for sale, Edinburg had the most land for sale. Hidalgo County is Texas's 18th largest county (1,582 square miles). It's located in the Lower Rio Grande Valley Texas region of the state.