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 recently; the overall value of all Madison County farms and ranches for sale was nearly $74 million. Madison County ranks 149th out of 254 counties in the Lone Star State for the total acreage of land currently advertised for sale. Of all locations in Madison County with farms, ranches, hunting land and other land for sale, Madisonville featured 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 the state.