Walnut Creek CA ZIP Code
Walnut Creek 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 Walnut Creek CA zip code by its streets and block numbers if we have some of the Walnut Creek streets loaded in our website
Walnut Creek Area Code is 925/510 and Time Zone is Pacific (GMT -08:00).
Walnut Creek Zip Code - California
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Walnut Creek City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Walnut Creek ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Walnut Creek, California.
The Walnut Creek Zip Code is 94595, 94596, 94597, 94598.
If you want to send a mail to Walnut Creek City, you should use the 94595, 94596, 94597, 94598 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Walnut Creek 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 94595, 94596, 94597, 94598 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Walnut Creek 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.