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. There was a total of around $89 million of farms and ranches for sale in Madison County recently on Land.com. The total acreage of all Madison County farms, ranches, and rural real estate for sale was nearly 6,000 acres. Madison County ranks 137th in the Lone Star State for the total number of acres of land currently advertised for sale. Among cities in Madison County with farms, ranches, and rural real estate 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.