Walnut Creek, California

4 ZIP codes · Pacific time

ZIP codes (largest first)

94598 · 27,20694596 · 23,41794597 · 23,12994595 · 16,988
Population70,088
StateCalifornia
CountyContra Costa County
Time zonePacific
Land area19.76 sq mi

Area codes in this area

925

These are the area codes that most often serve Walnut Creek (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 Walnut Creek

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