ZIP codes in Castro Valley, California
Castro Valley has 2 ZIP codes in this directory. Each ZIP is listed with its county, population and time zone.
| ZIP | County | Population | Time zone |
|---|---|---|---|
| 94546 | Alameda | 61,388 | America/Los_Angeles |
| 94552 | Alameda | 61,388 | America/Los_Angeles |
About Castro Valley ZIP codes
ZIP codes in Castro Valley are part of the USPS delivery network for California. The codes above are ordered numerically; each links to a page with coordinates, nearby ZIPs and more detail. Population shown is the estimated population of the city: 61,388.