Sanilac County, Michigan
County seat: Sandusky · Population 40,083 (2025) · 963 sq mi
Sanilac County is the 41st most populous of Michigan's 83 counties, with 40,083 people (2025 estimate). Its county seat is Sandusky. It is part of the East (Region 6) region, one of the 10 Michigan prosperity regions. The map shows its 13 cities and towns and the 4 neighboring counties.
Sanilac County facts
- County seat
- Sandusky
- Population (2025 estimate)
- 40,083 −1.3% since 2020
- Land area
- 963 sq mi 11th largest of 83
- Water area
- 627 sq mi
- Population density
- 42 per sq mi
- Established
- 1822
- Largest city
- Lexington 3,452
- Median household income
- $58,863
- Cities and towns
- 13 plus 1 CDPs
- ZIP codes
- 23
- Time zone
- Eastern
- FIPS code
- 26151
Cities and towns in Sanilac County
Sanilac County has 13 incorporated cities, towns and villages. Populations count the people living inside Sanilac County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Sandusky (county seat) | City | 2,664 | |
| Croswell | City | 2,263 | |
| Marlette | City | 1,833 | |
| Brown City | City | 1,277 | Lapeer County |
| Lexington | Village | 910 | |
| Deckerville | Village | 872 | |
| Peck | Village | 598 | |
| Port Sanilac | Village | 555 | |
| Carsonville | Village | 503 | |
| Applegate | Village | 227 | |
| Minden City | Village | 177 | |
| Melvin | Village | 152 | |
| Forestville | Village | 84 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Snover | 192 |
ZIP codes in Sanilac County
23 ZIP codes reach into Sanilac County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 48032 also St. Clair County
- 48097 also St. Clair County
- 48401
- 48410
- 48416 also Lapeer and St. Clair counties
- 48419
- 48422
- 48426
- 48427
- 48434
- 48441 also Huron County
- 48450
- 48453 also Lapeer and Tuscola counties
- 48454
- 48456 also Huron County
- 48465
- 48466
- 48469
- 48470 also Huron County
- 48471
- 48472
- 48475 also Huron County
- 48726 also Tuscola and Huron counties
Population of Sanilac County, 2020–2025
Sanilac County shrank by 528 people (−1.3%) between April 2020 and July 2025: 1,029 more deaths than births and a net gain of 515 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 40,499 |
| 2021 | 40,536 |
| 2022 | 40,506 |
| 2023 | 40,389 |
| 2024 | 40,238 |
| 2025 | 40,083 |
Neighboring counties
- Huron County north · 30,530 people
- St. Clair County south · 160,486 people
- Tuscola County west · 52,680 people
- Lapeer County southwest · 89,516 people
Printable Sanilac County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (145 KB)
- PNG (2400 px) (96 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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