St. Clair County, Michigan ZIP codes
23 ZIP codes are in St. Clair County, plus 2 that cross in from neighboring counties. It's part of the Detroit-Warren-Dearborn, MI metro area.
- ZIP codes
- 23
- Population in these ZIPs
- 161,718
- Avg. median income
- $72,000population-weighted
- Cities & towns
- 22
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in St. Clair County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 48001 | Algonac | 11,224 | $69,160 | $259,900 |
| 48002 | Allenton | 3,120 | $93,948 | $353,900 |
| 48004 PO Box | Anchorville | — | — | — |
| 48006 | Avoca | 3,889 | $71,385 | $305,700 |
| 48014 | Capac | 4,294 | $66,800 | $255,700 |
| 48022 | Emmett | 2,530 | $96,809 | $331,100 |
| 48023 | Fair Haven | 5,031 | $70,469 | $273,500 |
| 48027 | Goodells | 3,187 | $90,417 | $331,000 |
| 48028 | Harsens Island | 1,272 | $109,730 | $319,400 |
| 48032 | Jeddo | 1,871 | $96,875 | $310,300 |
| 48039 | Marine City | 7,437 | $82,755 | $224,500 |
| 48040 | Marysville | 9,925 | $66,901 | $233,000 |
| 48041 | Memphis | 4,302 | $75,677 | $329,700 |
| 48049 | North Street | 5,468 | $84,028 | $288,100 |
| 48054 | East China | 7,188 | $83,241 | $343,400 |
| 48059 | Fort Gratiot | 15,499 | $80,062 | $269,100 |
| 48060 | Port Huron | 39,342 | $53,018 | $173,600 |
| 48061 PO Box | Port Huron | — | — | — |
| 48063 | Columbus | 4,206 | $93,844 | $351,600 |
| 48064 | Casco | 4,180 | $87,538 | $383,600 |
| 48074 | Smiths Creek | 9,624 | $71,047 | $236,100 |
| 48079 | Saint Clair | 12,711 | $79,891 | $318,400 |
| 48097 | Yale | 5,418 | $63,659 | $245,600 |
ZIP codes partly in St. Clair County
These ZIP codes are mostly in a neighboring county but cover part of St. Clair County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 48416 | Brown City | Sanilac County | 4,996 | $66,474 | $228,200 |
| 48444 | Imlay City | Lapeer County | 9,483 | $71,436 | $283,200 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in St. Clair County
Nearby counties
Frequently asked questions
How many ZIP codes are in St. Clair County, Michigan?
23 ZIP codes are mainly in St. Clair County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in St. Clair County?
ZIP codes in St. Clair County use the city names Algonac, Allenton, Anchorville, Avoca, Capac, Casco, Columbus, East China, Emmett, Fair Haven, Fort Gratiot and Goodells and others.
What metro area is St. Clair County in?
St. Clair County is part of the Detroit-Warren-Dearborn, MI metropolitan statistical area.