Castro Valley, CA Insights: Population,
Zip Codes, Influence, and Service Areas

Castro Valley is a census-designated place (CDP) 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.

Zip Codes in Castro Valley, CA that we also serve: 94546 94552 94578





Cities Close To Castro Valley, CA That We Also Serve