San Mateo, California

5 ZIP codes · Pacific time

ZIP codes (largest first)

94403 · 43,27694404 · 35,88194401 · 35,29594402 · 25,47594497 (PO box)
Population103,105
StateCalifornia
CountySan Mateo County
Time zonePacific
Land area12.13 sq mi

Area codes in this area

650

These are the area codes that most often serve San Mateo (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Find the ZIP+4 for an address in San Mateo

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.