Sanilac County GIS Maps
Sanilac County, Michigan, has 40,611 residents and covers 962.6 square miles. The population declined 5.8% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Sanilac County is 26151.
Sandusky is the county's largest population center. Sanilac County also includes 18 zip codes, 11 public school districts and 46 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 population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Sanilac County Trends
- Population
- 40,611▾
- Median Home Value
- $162,200▴
- K-12 Enrollment
- 9,018▾
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.
Sanilac 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.
Sanilac County Population
Sanilac County had 40,611 residents in 2020. That was 5.8% lower than in 2010. Sanilac County had 3,936 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 42 people per square mile. Some of the county's most populated postal areas include Croswell, Sandusky and Marlette.
Population Trend in Sanilac County MI
Sanilac County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Sanilac County Zip Codes
Sanilac County has 18 zip codes. Some of the county's most populated zip codes include Croswell (48422), Sandusky (48471) and Marlette (48453). Croswell is the largest zip by population, with about 6,130 residents or 15% of the county total. Together, the three largest zips account for about 41% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Sanilac County MI
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 48422 | Croswell | 6,130 | ▾ -4.2% |
| 48471 | Sandusky | 5,668 | ▾ -1.3% |
| 48453 | Marlette | 4,956 | ▾ -3.7% |
| 48416 | Brown City | 4,906 | ▾ -1.9% |
| 48450 | Lexington | 4,199 | ▾ -12.2% |
| Download all zip code data | |||
Sanilac County Zip Code populations and trends per most recent census data.
Sanilac County Demographics
Sanilac County has a median age of 45.3, which makes the county a little older than Michigan overall. About 21.2% of residents are under 18, while 22.6% 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 26.9% of the population, which points to a solid working-age base. About 16% 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 Sanilac County MI
Median Age
45.3
Under 18
21.2%
Age 65+
22.6%
Bachelor's+
16%
Sanilac County School Districts
Sanilac County is served by 11 public school districts with 9,018 students enrolled in 2024. The largest districts on the county map are Yale Public Schools, Croswell-Lexington Community and Sandusky Community. Those three districts account for about 48% 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 Sanilac County MI
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Yale Public Schools | 1,723 | 19.1% | ▾ -0.7% |
| Croswell-Lexington Community School District | 1,708 | 18.9% | ▾ -3.3% |
| Sandusky Community School District | 931 | 10.3% | ▾ -3.7% |
| Cass City Public Schools | 877 | 9.7% | ▾ -4.5% |
| Marlette Community Schools | 699 | 7.8% | ▾ -1.8% |
| Download all school district data | |||
Sanilac County school district enrollment and trends per most recent NCES reporting data.
Sanilac County Housing & Real Estate
Sanilac County has a median home value of $162,200 and a median gross rent of $814. About 82% 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 $254,950 and homes spent about 80 days on the market.
Sanilac County Housing Mix
Sanilac County housing mix: owner, renter and vacant units.
Sanilac County Housing Trends
Sanilac County median home value and rent trend (last 5 years).
Businesses in Sanilac County, MI
Sanilac County has 1,777 business listings across 408 categories. The largest categories in Sanilac County business listings are Churches & Religious Organizations (76, 4.3%), Farm (42, 2.4%), and Auto Repair (38, 2.1%). The full Sanilac County business listings dataset includes names, categories, addresses and contact details where available. Sanilac County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Sanilac County, MI
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 76 | 4.3% |
| Farm | 42 | 2.4% |
| Auto Repair | 38 | 2.1% |
| Gas Stations | 26 | 1.5% |
| Banks & Credit Unions | 25 | 1.4% |
| Convenience Stores | 24 | 1.4% |
| Community & Nonprofits | 23 | 1.3% |
| Parks & Recreation | 23 | 1.3% |
| Insurance Agencies | 22 | 1.2% |
| Contractors | 22 | 1.2% |
Sanilac County Business Listings
| Business | Category | City |
|---|---|---|
| The Lodge | Accommodation | Deckerville |
| Shaw, Franzel and Kursinsky | Accountant | Sandusky |
| Lakeshore Garden Club | Active Life | Croswell |
| Twin Ash Farms Organic Processing | Agricultural Cooperatives | Snover |
| Cutler Pheasant, Poultry and Beekeeping Supply | Agricultural Service | Washington Twp |
| Helena Agri-Enterprises, LLC | Agriculture | Croswell |
| Midwest Sky Sports | Aircraft Manufacturer | Sandusky |
| Marlette Airport | Airport | Marlette |
| Austin Construction LLC | Altering And Remodeling Contractor | Lexington |
| Croswell EMS | Ambulance And Ems Services | Croswell |
| Download Sanilac County business listings | ||
Sanilac County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Sanilac County Basemaps
Sanilac County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Sanilac County Data Package
This page shows a preview of what's included in the Sanilac 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 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 Sanilac County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.