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. Land for sale in Mills County recently totaled almost $146 million and almost 100,000 acres. Mills County ranks 138th in the Lone Star State for the combined amount of land currently advertised for sale. There were five properties listed as sold in Mills County through the Land Network Comparable Sales Program. This represented a total value of $5,817,000. Goldthwaite had the most land for sale. Agriculture and farming drives the Mills County economy, with 870 farms recorded in the county during the U.S. Census in 2012. Farming activities in Mills County generate annual revenues of $4 million, the majority of which comes from livestock products. Mills County is Texas's 213th biggest county (749 square miles). It's located in the Hill Country North Texas region of Texas.