County ProfileMI
St. Clair County
Population: 160,383 · 21 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
160,383
People
Median age
44.5
Housing
Total households
67,816
Income
Median household income
$71,270
Housing
Total housing units
72,799
Employment
Employment rate
57.2%
Education
Bachelor’s degree or higher
20.3%
Healthcare
Insured population
95.1%
County details
Local time 06:36:12(ET)| Name | St. Clair |
|---|---|
| Total ZIP codes | 21total |
| ZIP codes (by type) | 20 Standard1 PO Box |
| Area code | 586, 810 |
| Timezone | Eastern Time (ET) |
| Coordinates | 42.9288035, -82.6689135 |
| Land area | 721.5 sq miles(1,868.7 km²) |
Map of St. Clair county, Michigan with ZIP codes
Cities and Communities in St. Clair County
Compare the largest cities in St. Clair County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Port Huron | 28,983 | $50,366 | 2ZIPs |
| Fort Gratiot | 15,319 | — | 1ZIPs |
| Marysville | 9,997 | $66,901 | 1ZIPs |
| Smiths Creek | 9,608 | — | 1ZIPs |
| East China | 7,213 | — | 1ZIPs |
| North Street | 5,523 | — | 1ZIPs |
| Saint Clair | 5,464 | $69,688 | 1ZIPs |
| Fair Haven | 4,967 | — | 1ZIPs |
| Algonac | 4,196 | $56,820 | 1ZIPs |
| Columbus | 4,112 | — | 1ZIPs |
| Marine City | 4,079 | $67,683 | 1ZIPs |
| Casco | 3,993 | — | 1ZIPs |
| Avoca | 3,895 | — | 1ZIPs |
| Goodells | 3,180 | — | 1ZIPs |
| Allenton | 3,115 | — | 1ZIPs |
| Jeddo | 2,193 | — | 1ZIPs |
| Capac | 1,983 | $60,329 | 1ZIPs |
| Yale | 1,903 | $53,236 | 1ZIPs |
| Harsens Island | 921 | — | 1ZIPs |
| Emmett | 258 | $120,074 | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in St. Clair County
Review the most populated postal areas across St. Clair County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 48060 | Port Huron | $53,018 | 39,775 |
| 48059 | Fort Gratiot | $80,062 | 15,319 |
| 48079 | Saint Clair | $79,891 | 12,553 |
| 48001 | Algonac | $69,160 | 11,721 |
| 48040 | Marysville | $66,901 | 9,994 |
| 48074 | Smiths Creek | $71,047 | 9,608 |
| 48039 | Marine City | $82,755 | 7,485 |
| 48054 | East China | $83,241 | 7,213 |
| 48049 | North Street | $84,028 | 5,523 |
| 48097 | Yale | $63,659 | 5,181 |
| 48023 | Fair Haven | $70,469 | 4,967 |
| 48014 | Capac | $66,800 | 4,323 |
| 48063 | Columbus | $93,844 | 4,112 |
| 48064 | Casco | $87,538 | 3,993 |
| 48006 | Avoca | $71,385 | 3,895 |
| 48027 | Goodells | $90,417 | 3,180 |
| 48002 | Allenton | $93,948 | 3,115 |
| 48022 | Emmett | $96,809 | 2,515 |
| 48032 | Jeddo | $96,875 | 2,193 |
| 48028 | Harsens Island | $109,730 | 921 |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS