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ZIP codes in Marin County

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

42

ZIP codes

2

cross the county line

290,846

people in these ZIPs

58

counties in CA

Most people

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Marin County ZIP list

More counties in California

All 58 counties in California

Questions people actually ask

How many ZIP codes are in Marin County, California?

42 ZIP codes reach into Marin County, including 13 PO Box or single-address ZIPs placed by the town they serve. 2 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Marin County has the most people?

94901 (San Rafael) has about 41,307 residents, the most of any ZIP touching Marin County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Marin 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 Marin 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