Clayton CA ZIP Code
Clayton city is located in California State, Contra Costa County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Clayton CA zip code by its streets and block numbers if we have some of the Clayton streets loaded in our website
Clayton Area Code is 925 and Time Zone is Pacific (GMT -08:00).
Clayton Zip Code - California
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Clayton City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Clayton ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Clayton, California.
The Clayton Zip Code is 94517.
If you want to send a mail to Clayton City, you should use the 94517 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Clayton 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 94517 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Clayton 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.