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Where am ILOCATED

St. Clair County, Michigan

St. Clair County, Michigan, has 160,486 residents (July 2025 estimate). Its county seat is Port Huron. It uses Eastern Time and covers 722 sq mi (1,869 km²) of land.

DetroitGrand RapidsWarren
St. Clair County in Michigan
Lapeer CountyMacomb CountyPort HuronMarysvilleRichmondSt. ClairPearl Beach
St. Clair County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
160,486
Land area
722 sq mi (1,869 km²)
County seat or government
Port Huron
Time zone
Eastern TimeUTC-05:00 in January; UTC-04:00 in July
Median household income
$71,270 ± $1,351
Median home value
$224,600 ± $3,575
Median rent, with utilities
$1,029 ± $25
Homes lived in by their owners
80.8% ± 1.2 points
County type
County
Metro or micro area
Detroit-Warren-Dearborn, MI metro areaOutlying county
Water area
115 sq mi (298 km²)
State
Michigan
County code (FIPS)
26147
Coordinates (central point)
42.928803, -82.668913
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in St. Clair County

Time zoneLocal time and UTC offsetNext clock change
Eastern TimeAmerica/DetroitUTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 4806039,342 people
  2. 4805915,499 people
  3. 4807912,711 people
  4. 4800111,224 people
  5. 480409,925 people
  6. 480749,624 people
  7. 484449,483 people
  8. 480397,437 people
  9. 480547,188 people
  10. 480495,468 people
  11. 480975,418 people
  12. 480235,031 people
All 23
  1. 484164,996 people
  2. 480414,302 people
  3. 480144,294 people
  4. 480634,206 people
  5. 480644,180 people
  6. 480063,889 people
  7. 480273,187 people
  8. 480023,120 people
  9. 480222,530 people
  10. 480321,871 people
  11. 480281,272 people

23 ZIP Code areas overlap St. Clair County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in St. Clair County, largest first

  1. Fort Gratiot Charter Township11,434 people
  2. Port Huron Charter Township10,722 people
  3. Kimball Township9,624 people
  4. Clay Township8,357 people
  5. St. Clair Township7,126 people
  6. Clyde Township5,468 people
  7. Ira Township5,031 people
  8. Columbus Township4,206 people
  9. Mussey Township4,205 people
  10. Casco Township4,180 people
  11. Burtchville Township4,065 people
  12. East China Township3,686 people
All 23
  1. China Township3,502 people
  2. Cottrellville Township3,409 people
  3. Riley Township3,191 people
  4. Wales Township3,187 people
  5. Berlin Township3,120 people
  6. Emmett Township2,530 people
  7. Kenockee Township2,387 people
  8. Brockway Township1,834 people
  9. Grant Township1,664 people
  10. Greenwood Township1,502 people
  11. Lynn Township1,054 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Michigan, by county

School districts in St. Clair County, largest first

  1. Port Huron Area School District68,080 people
  2. Anchor Bay School District37,021 people
  3. East China School District28,603 people
  4. Algonac Community School District14,789 people
  5. Marysville Public Schools13,980 people
  6. Croswell-Lexington Community School District13,098 people
  7. Richmond Community Schools13,051 people
  8. Yale Public Schools10,808 people
  9. Almont Community Schools9,258 people
  10. Armada Area Schools8,831 people
  11. Capac Community School District8,708 people
  12. Memphis Community Schools5,226 people
All 13
  1. Brown City Community School District4,928 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Port Huron, Michigan (city)28,620 people
  2. Marysville, Michigan (city)9,925 people
  3. Richmond, Michigan (city)5,855 people
  4. St. Clair, Michigan (city)5,585 people
  5. Pearl Beach, Michigan (CDP)4,506 people
  6. Algonac, Michigan (city)4,139 people
  7. Marine City, Michigan (city)4,028 people
  8. Yale, Michigan (city)2,129 people
  9. Capac, Michigan (village)1,970 people
  10. Memphis, Michigan (city)1,064 people
  11. Lakeport, Michigan (CDP)742 people
  12. Ruby, Michigan (CDP)714 people
All 13
  1. Emmett, Michigan (village)207 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Macomb County, Michigan22 mi southwest
  2. Lapeer County, Michigan30 mi west
  3. Sanilac County, Michigan36 mi north

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.