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Physical Features: Central county near Austin. Level to rolling; mostly Blackland soil, some loam, sand; drained by San Gabriel River and tributaries; Granger Lake, Lake Georgetown.
Economy: Agribusinesses, varied manufacturing, education center, government/services; the county is part of Austin metropolitan area.
History: Tonkawa area; later, other tribes. Comanches raided until 1860s. Anglo-American settlement began in late 1830s. County named for Robert M. Williamson, pioneer leader; created from Milam and organized in 1848.
Race/Ethnicity: (In percent) Anglo, 63.09; Black, 6.13; Hispanic, 23.61; Asian, 4.90; Other, 2.27.
Vital Statistics, annual: Births, 6,164; deaths, 1,870; marriages, 2,213; divorces, 820.
Recreation: Lake recreation; Inner Space Cavern; historic sites; deer hunting, fishing; Gov. Dan Moody Museum at Taylor; San Gabriel Park; old settlers park; walking tours, rattlesnake sacking, barbecue cookoff, frontier days in summer; Round Rock minor league baseball; Cedar Park Center, home of Austin Toros basketball and Texas Stars hockey.
Minerals: Building stone, sand and gravel.
Agriculture: Corn, cattle, sorghum, cotton, wheat, hay, nusery crops. Market value $190.4 million.
GEORGETOWN (47,400) county seat; education, health, government/services, manufacturing, retail; hospital; Southwestern University; Red Poppy festival in April.
ROUND ROCK (99,887, part [1,362] in Travis County) semiconductor, varied manufacturing, tourism and distribution center; hospital; Texas Baptist Children’s Home.
Cedar Park (48,937, part  in Travis County) energy equipment manufacturing, millwork, concrete production, commuting to Austin; hospital, community college extension; steam-engine train; Cedar Fest in the spring.
Taylor (15,191) agribusiness, publishing center, varied manufacturing including cottonseed and meat processing; hospital.
Other towns include: Andice (300); Bartlett (1,623, partly in Bell County) cotton, corn production, commuters, prison, first rural electrification in nation in 1933, clinic, library, Friendship Fest in September; Brushy Creek (21,764); Coupland (280); Florence (1,136).
Also, Granger (1,419); Hutto (14,698) agriculture, manufacturing, government/services, commuters to Austin, museum, Olde Tyme Days in October; Jarrell (984); Jollyville (16,151, partly in Travis County); Leander (26,521); Liberty Hill (967) artisans center; Schwertner (175); Thrall (839); Walburg (277); Weir (450).
Also, part [35,697] of Austin.