Interstate 35 follows the edge of the Balcones fault line through Round Rock. East of it lies flat Blackland Prairie with black, clay-rich soil; west of it, hilly karst with little topsoil. Local pests sort themselves along the same line.
Round Rock took shape in 1851 on the banks of Brushy Creek, beside the anvil-shaped rock that marked a low-water crossing later used by Chisholm Trail cattle drives. The city lies mostly in Williamson County, with part in Travis County, about 17 miles north of downtown Austin at an elevation near 735 feet. The census counted 12,740 residents in 1980 and 119,468 in 2020, growth that followed the interstate and the arrival of Dell's headquarters in the 1990s.
Much of the housing is therefore recent, set in planned subdivisions and utility districts such as Brushy Creek, Teravista and Paloma Lake, while Old Town keeps buildings from the cattle-trail years. Lawns on former cotton ground and rocky lots on the west side do not share the same pests. Precision Pest Control takes on residential, commercial and real estate work in Round Rock, and every estimate is free.