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 combined around 5,000 acres were listed for sale in Madison County, Texas, recently; the combined value of all Madison County farms, ranches, and rural real estate for sale was almost $61 million. Madison County ranks 177th in Texas for the combined amount of land currently advertised for sale. Of all land for sale in Madison County, Madisonville featured the most land for sale. Government and state-level services are the main economic drivers in Madison County. Madison County is Texas's 242nd largest county (472 square miles). It's located in the Brazos Texas region of the state.