Castro Valley, CA

Castro Valley is a census-designated place in Alameda County, California, United States. At the 2010 census, it was the fifth most populous unincorporated area in California and the twenty-third most populous in the United States. The population was 66,441 at the 2020 census.
  • Elevation: 161 ft (49 m)
  • Country: United States
  • State: California
  • County: Alameda
  • ZIP codes: 94546, 94552, 94541,
  • Area code(s): 510, 341
  • FIPS code: 06-11964
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