San Mateo CA ZIP Code
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San Mateo city is located in California State, San Mateo County and has a unique zip code assigned by the US Postal Service Office.
You can search for the San Mateo CA zip code by its streets and block numbers if we have some of the San Mateo streets loaded in our website
San Mateo Area Code is 650 and Time Zone is Pacific (GMT -08:00).
San Mateo Zip Code - California
The US ZIP Code basic format consists of five decimal numerical digits assigned to the San Mateo City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the San Mateo ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in San Mateo, California.
The San Mateo Zip Code is 94401, 94402, 94403, 94404, 94497.
If you want to send a mail to San Mateo City, you should use the 94401, 94402, 94403, 94404, 94497 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded San Mateo 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 94401, 94402, 94403, 94404, 94497 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a San Mateo 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.