Antioch CA ZIP Code
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Antioch 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 Antioch CA zip code by its streets and block numbers if we have some of the Antioch streets loaded in our website
Antioch Area Code is 925 and Time Zone is Pacific (GMT -08:00).
Antioch Zip Code - California
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Antioch City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Antioch ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Antioch, California.
The Antioch Zip Code is 94509, 94531.
If you want to send a mail to Antioch City, you should use the 94509, 94531 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Antioch 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 94509, 94531 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Antioch 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.