|Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. As of the 2000 census, it is the fifth most populous unincorporated area in California[bettersourceneeded] and the twenty-third most populous in the United States. The population was 61,388 at the 2010 census. Castro Valley is named after Don Guillermo Castro, who was a soldier in the Mexican army and a rancher. First known for chicken ranches, Castro Valley eventually became a bedroom community.|
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