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ZIP codes in San Luis Obispo County

41 ZIPs touch San Luis Obispo County, California. The blue dashed line is the county border; orange ZIPs reach into it.

41

ZIP codes

8

cross the county line

394,852

people in these ZIPs

58

counties in CA

Most people

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San Luis Obispo County ZIP list

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Questions people actually ask

How many ZIP codes are in San Luis Obispo County, California?

41 ZIP codes reach into San Luis Obispo County, including 11 PO Box or single-address ZIPs placed by the town they serve. 8 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in San Luis Obispo County has the most people?

93458 (Santa Maria) has about 59,148 residents, the most of any ZIP touching San Luis Obispo County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in San Luis Obispo 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 San Luis Obispo 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