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ZIP codes in Sonoma County

52 ZIPs touch Sonoma County, California. The blue dashed line is the county border; orange ZIPs reach into it.

52

ZIP codes

5

cross the county line

500,035

people in these ZIPs

58

counties in CA

Most people

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Sonoma County ZIP list

More counties in California

All 58 counties in California

Questions people actually ask

How many ZIP codes are in Sonoma County, California?

52 ZIP codes reach into Sonoma County, including 12 PO Box or single-address ZIPs placed by the town they serve. 5 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Sonoma County has the most people?

94928 (Rohnert Park) has about 46,829 residents, the most of any ZIP touching Sonoma County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Sonoma County and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Sonoma County. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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Updated 2026-11-10 · Where the data comes from