Castro Valley, California
Unincorporated community in California, United States
Castro Valley, California
Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. At the 2020 census, it was the fourth most populous unincorporated area in California. The population was 66,441 at the 2020 census. Castro Valley is named after Guillermo Castro, a noted 19th-century Mexican Californio ranchero who owned the land where the community is located.
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