St. Clair County GIS Maps
St. Clair County, Michigan, has 160,383 residents across 88,161 parcels and covers 721.3 square miles. The population declined 1.6% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for St. Clair County is 26147.
Port Huron is the county's largest population center. St. Clair County also includes 21 zip codes, 13 public school districts and 45 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show parcel data, population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers, Parcels and sample data. Paid packages add full layers, analytics and database files.
St. Clair County Trends
- Population
- 160,383▾
- Median Home Value
- $213,900▴
- K-12 Enrollment
- 29,694▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
St. Clair County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
St. Clair County Parcels
St. Clair County has 88,161 mapped parcels covering 457,373 acres. The median assessed value is $164,674. The median lot size is 0.47 acres. 11,292 parcels are 10 acres or larger. The records carry 71,457 distinct owner names. Owner names, mailing addresses, assessed values and lot sizes are on nearly every parcel. Site addresses reach 95.0%. Browse the interactive St. Clair County Parcel viewer here.
St. Clair County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 88,161 | 100% |
| Owner name | 88,104 | 99.9% |
| Owner mailing address | 87,012 | 98.7% |
| Site address | 83,761 | 95.0% |
| Land use code | 88,127 | 99.9% |
| Land use description | 0 | 0% |
| Assessed value | 88,127 | 99.9% |
| Land value | 88,127 | 99.9% |
| Improvement value | 88,127 | 99.9% |
| Acreage | 88,155 | 99.9% |
| Parcel boundary | 88,161 | 100% |
| Download all St. Clair County parcels. | ||
Field coverage measured across all St. Clair County parcel records.
St. Clair County Population
St. Clair County had 160,383 residents in 2020. That was 1.6% lower than in 2010. St. Clair County had 3,852 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 222 people per square mile. Some of the county's most populated postal areas include Port Huron, Fort Gratiot and Saint Clair.
Population Trend in St. Clair County MI
St. Clair County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Clair County Zip Codes
St. Clair County has 21 zip codes. Some of the county's most populated zip codes include Port Huron (48060), Fort Gratiot (48059) and Saint Clair (48079). Port Huron is the largest zip by population, with about 39,775 residents or 25% of the county total. Together, the three largest zips account for about 42% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Clair County MI
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 48060 | Port Huron | 39,775 | ▾ -2.6% |
| 48059 | Fort Gratiot | 15,319 | ▴ 1.3% |
| 48079 | Saint Clair | 12,553 | ▴ 2% |
| 48001 | Algonac | 11,721 | ▾ -2.2% |
| 48040 | Marysville | 9,994 | ▴ 0.4% |
| Download all zip code data | |||
St. Clair County Zip Code populations and trends per most recent census data.
St. Clair County Demographics
St. Clair County has a median age of 44.3, which makes the county a little older than Michigan overall. About 20.5% of residents are under 18, while 19.8% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 28.9% of the population, which points to a solid working-age base. About 20.3% of adults have a bachelor's degree or higher, above the statewide figure of 31.8%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for St. Clair County MI
Median Age
44.3
Under 18
20.5%
Age 65+
19.8%
Bachelor's+
20.3%
St. Clair County School Districts
St. Clair County is served by 13 public school districts with 29,694 students enrolled in 2024. The largest districts on the county map are Port Huron Area, Anchor Bay and East China. Those three districts account for about 53% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in St. Clair County MI
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Port Huron Area School District | 6,916 | 23.3% | ▾ -2.3% |
| Anchor Bay School District | 5,280 | 17.8% | ▾ -1% |
| East China School District | 3,405 | 11.5% | ▾ -3% |
| Marysville Public Schools | 2,655 | 8.9% | ▾ -1.7% |
| Yale Public Schools | 1,723 | 5.8% | ▾ -0.7% |
| Download all school district data | |||
St. Clair County school district enrollment and trends per most recent NCES reporting data.
St. Clair County Housing & Real Estate
St. Clair County has a median home value of $213,900 and a median gross rent of $999. About 81% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Michigan median, while rents come in below the state average. In March 2026, the median listing price was $312,450 and homes spent about 48 days on the market.
St. Clair County Housing Mix
St. Clair County housing mix: owner, renter and vacant units.
St. Clair County Housing Trends
St. Clair County median home value and rent trend (last 5 years).
Businesses in St. Clair County, MI
St. Clair County has 5,903 business listings across 708 categories. The largest categories in St. Clair County business listings are Churches & Religious Organizations (146, 2.5%), Real Estate Agents (108, 1.8%), and Auto Repair (107, 1.8%). The full St. Clair County business listings dataset includes names, categories, addresses and contact details where available. St. Clair County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in St. Clair County, MI
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 146 | 2.5% |
| Real Estate Agents | 108 | 1.8% |
| Auto Repair | 107 | 1.8% |
| Contractors | 103 | 1.7% |
| Parks & Recreation | 96 | 1.6% |
| Gas Stations | 89 | 1.5% |
| Medical Offices | 69 | 1.2% |
| Insurance Agencies | 65 | 1.1% |
| Convenience Stores | 62 | 1.1% |
| Community & Nonprofits | 61 | 1.0% |
St. Clair County Business Listings
| Business | Category | City |
|---|---|---|
| Port Huron Odyssey House | Abuse And Addiction Treatment | Port Huron |
| Lake Huron Retreat Center | Accommodation | Burtchville Twp |
| Taxevo CPAs | Accountant | Port Huron |
| Port Huron Yacht Club | Active Life | Port Huron |
| Huron Point Acupuncture | Acupuncture | Port Huron |
| Biscos Adult Novelty Store | Adult Entertainment | Riley Twp |
| Petoskey Stone Media | Advertising Agency | Port Huron |
| St. Clair County Farm Bureau | Agricultural Cooperatives | Marysville |
| Sulkowski Seeds LLC | Agricultural Service | Wales Twp |
| Vogelsberg Grain Company | Agriculture | Yale |
| Download St. Clair County business listings | ||
St. Clair County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Clair County Data Package
This page shows a preview of what's included in the St. Clair County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for parcels, zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border St. Clair County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.