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ZIP codes in St. Clair County

25 ZIPs touch St. Clair County, Michigan. The blue dashed line is the county border; orange ZIPs reach into it.

25

ZIP codes

6

cross the county line

176,197

people in these ZIPs

83

counties in MI

Most people

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St. Clair County ZIP list

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Questions people actually ask

How many ZIP codes are in St. Clair County, Michigan?

25 ZIP codes reach into St. Clair County, including 2 PO Box or single-address ZIPs placed by the town they serve. 6 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in St. Clair County has the most people?

48060 (Port Huron) has about 39,342 residents, the most of any ZIP touching St. Clair County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in St. Clair 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 St. Clair 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