There are 21 zip codes in St. Clair County, Michigan. The most populated is 48060, located in Port Huron. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4806039,644Port Huron
4805915,314Fort Gratiot
4807912,572Saint Clair
4800111,691Algonac
480409,973Marysville
480749,594Smiths Creek
480397,486Marine City
480547,204East China
480495,509North Street
480975,333Yale
480234,993Fair Haven
480414,415Memphis
480144,334Capac
480634,093Columbus
480644,001Casco
480063,945Avoca
480273,187Goodells
480023,121Allenton
480222,527Emmett
480321,864Jeddo
48028961Harsens Island
showing: 21 rows

Zip Codes in St. Clair County, Michigan by Population (2024)