Barstow (bärˈstō) [key], city (1990 pop. 21,472), San Bernardino co., SE Calif., on the dry Mojave River; founded in the 1880s as a silver-mining town, inc. 1947. Railroad shops and the Goldstone space tracking station are major employers. Several U.S. military facilities are nearby. Barstow is an outfitting point for expeditions into Death Valley.