San Mateo, CA ZIP Codes
San Mateo, California has 5 ZIP codes: 4 for street addresses (, , and ) and 1 for a single organization.
Your street decides which one you use.
Which San Mateo ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
San Mateo ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
94497 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: San Mateo city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All San Mateo ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 94401 | street delivery Saint Matthew |
| 94402 | street delivery San Mateo Sorting and Delivery Center |
| 94403 | street delivery 25th Avenue |
| 94404 | street delivery Foster City |
| 94497 | one organization San Mateo Sorting and Delivery Center |
Why your mail may say San Mateo when you live outside it
San Mateo ZIP codes also cover Foster City, Highlands and Baywood Park, so a letter addressed to San Mateo can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. San Mateo County property records show which city you are in.
San Mateo ZIP code questions
What is the main ZIP code for San Mateo?
94402, the ZIP code of the main San Mateo Sorting and Delivery Center post office at 1630 S Delaware St.
What county is San Mateo in?
San Mateo County.
ZIP codes for towns near San Mateo
More towns near San Mateo: Menlo Park, Hayward, San Leandro, Alameda, Daly City, Palo Alto, Oakland, Newark, Union City.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections