Alameda County – 94552 – Castro Valley – CA – 46/46

Cities: Castro Valley, CA (17.97%), Hayward, CA (9.33%), Sunol, CA (0.09%), Union City, CA (0.08%), Fairview, CA (0.02%)
County: Alameda County, CA

Estimated zip code population in 2011: 14,568
Zip code population in 2010: 14,454
Zip code population in 2000: 13,202