Round Rock is a city in the U.S. state of Texas, located in Williamson County (with a small part in Travis), which is a part of the Greater Austin, Texas metropolitan area. The population was 99,887 at the 2010 census.
The city straddles both sides of the Balcones Escarpment, a fault line in which the areas roughly east of IH-35 are flat and characterized by having black, fertile soils of the Blackland Prairie, and the west side of the Escarpment which consists mostly of hilly, karst-like terrain with little topsoil and higher elevations and which is part of the Texas Hill Country. Located about 20 miles (32 km) north of downtown Austin, Round Rock shares a common border with Austin at Texas State Highway 45.
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Excerpt taken from https://en.wikipedia.org/wiki/Round_Rock,_Texas