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 value of all farms, ranches, and rural real estate for sale in Madison County, Texas, recently was nearly $86 million, representing a combined 4,471 acres of land for sale in Madison County. Madison County ranks 137th in the state for the total acreage of land currently advertised for sale. Among cities in Madison County with 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 the 242nd largest county (472 square miles) in Texas. It's located in the Brazos Texas region of Texas.