Iosco County, Michigan
County seat: Tawas City · Population 25,266 (2025) · 550 sq mi
Iosco County is the 58th most populous of Michigan's 83 counties, with 25,266 people (2025 estimate). Its county seat is Tawas City. It is part of the Northeast (Region 3) region, one of the 10 Michigan prosperity regions. The map shows its 3 cities and towns and the 5 neighboring counties.
Iosco County facts
- County seat
- Tawas City
- Population (2025 estimate)
- 25,266 +0.1% since 2020
- Land area
- 550 sq mi 59th largest of 83
- Water area
- 1,341 sq mi
- Population density
- 46 per sq mi
- Established
- 1840
- Largest city
- Oscoda 7,158
- Median household income
- $50,066
- Cities and towns
- 3 plus 3 CDPs
- ZIP codes
- 12
- Time zone
- Eastern
- FIPS code
- 26069
Cities and towns in Iosco County
Iosco County has 3 incorporated cities, towns and villages. Populations count the people living inside Iosco County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| East Tawas | City | 2,662 | |
| Tawas City (county seat) | City | 1,830 | |
| Whittemore | City | 419 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Au Sable | 1,643 | |
| Sand Lake | 1,348 | |
| Oscoda | 654 |
ZIP codes in Iosco County
12 ZIP codes reach into Iosco County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 48730
- 48737 also Alcona County
- 48738 also Alcona County
- 48739 also Ogemaw County
- 48743
- 48745 also Alcona County
- 48748
- 48750 also Alcona County
- 48761 also Ogemaw, Alcona and Oscoda counties
- 48763 also Arenac County
- 48765 also Arenac County
- 48770 also Ogemaw County
Population of Iosco County, 2020–2025
Iosco County grew by 34 people (+0.1%) between April 2020 and July 2025: 1,402 more deaths than births and a net gain of 1,444 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 25,189 |
| 2021 | 25,360 |
| 2022 | 25,451 |
| 2023 | 25,404 |
| 2024 | 25,425 |
| 2025 | 25,266 |
Neighboring counties
- Alcona County north · 10,556 people
- Huron County southeast · 30,530 people
- Arenac County southwest · 15,068 people
- Ogemaw County west · 21,121 people
- Oscoda County northwest · 8,723 people
Printable Iosco 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) (132 KB)
- PNG (2400 px) (77 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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