Castro Valley
Census-designated place in California
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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. The population was 66,441 at the 2020 census. Wikipedia
ZIP codes: 94546, 94552, 94541
Population: 65,444 (2022)
Founder: Don Guillermo Castro
Area code(s): 510, 341
Elevation: 161 ft (49 m)