The central region of Texas covers the state's three largest cities: Houston, Dallas-Fort Worth and San Antonio. The limestone terrain of Texas Hill Country lies in Central Texas, as do the state's three largest rivers, the Trinity, the Brazos and the Colorado. The combined value of land and rural real estate for sale in Madison County recently on Land.com was $82 million. This represents approximately 5,000 acres of farms, ranches, hunting land and other land for sale in Madison County. Madison County ranks 143rd in the Lone Star State for the combined amount of land currently advertised for sale. There were three properties listed as sold in Madison County through the Land Network Comparable Sales Program. This represented a total value of $280,260. Among cities in Madison County with land for sale, Madisonville had the most land for sale. From an economic perspective, government and state-level services contribute most to Madison County's overall GDP. Madison County is Texas's 242nd biggest county (472 square miles). It's located in the Brazos Texas region of Texas.