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. A total of approximately 5,000 acres were listed for sale in Madison County, Texas, recently, representing a total value of nearly $80 million in Madison County ranches, farms, hunting land and other rural land and acreage for sale. Madison County ranks 137th in Texas for the combined amount of land currently advertised for sale. Of all farms, ranches, and rural real estate for sale in Madison County, 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 largest county (472 square miles). It's located in the Brazos Texas region of the state.