Castro Valley CA ZIP Code
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Castro Valley city is located in California State, Alameda County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Castro Valley CA zip code by its streets and block numbers if we have some of the Castro Valley streets loaded in our website
Castro Valley Area Code is 510 and Time Zone is Pacific (GMT -08:00).
Castro Valley Zip Code - California
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Castro Valley City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Castro Valley ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Castro Valley, California.
The Castro Valley Zip Code is 94546, 94552.
If you want to send a mail to Castro Valley City, you should use the 94546, 94552 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Castro Valley ZIP code system that it called ZIP+4, often called "plus-four codes", "add-on codes", or "add ons". A ZIP+4 code uses the basic 94546, 94552 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Castro Valley city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in California.