Alger County, Michigan
County seat: Munising · Population 8,641 (2025) · 915 sq mi
Alger County is the 78th most populous of Michigan's 83 counties, with 8,641 people (2025 estimate). Its county seat is Munising. It is part of the Upper Peninsula (Region 1) region, one of the 10 Michigan prosperity regions. The map shows its 2 cities and towns and the 5 neighboring counties.
Alger County facts
- County seat
- Munising
- Population (2025 estimate)
- 8,641 −2.2% since 2020
- Land area
- 915 sq mi 12th largest of 83
- Water area
- 4,133 sq mi
- Population density
- 9 per sq mi
- Established
- 1885
- Named after
- Russell Alexander Alger Union Army general (1836-1907)
- Largest city
- Munising 2,759
- Median household income
- $61,286
- Cities and towns
- 2 plus 1 CDPs
- ZIP codes
- 13
- Time zone
- Eastern
- FIPS code
- 26003
Cities and towns in Alger County
Alger County has 2 incorporated cities, towns and villages. Populations count the people living inside Alger County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Munising (county seat) | City | 1,938 | |
| Chatham | Village | 214 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Grand Marais | 153 |
ZIP codes in Alger County
13 ZIP codes reach into Alger County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 49806
- 49816
- 49822 also Marquette County
- 49825
- 49826
- 49839
- 49862
- 49878 also Delta County
- 49883 also Schoolcraft County
- 49884 also Schoolcraft County
- 49885 also Marquette County
- 49891
- 49895 also Delta and Schoolcraft counties
Population of Alger County, 2020–2025
Alger County shrank by 198 people (−2.2%) between April 2020 and July 2025: 261 more deaths than births and a net gain of 50 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 8,845 |
| 2021 | 8,777 |
| 2022 | 8,782 |
| 2023 | 8,753 |
| 2024 | 8,707 |
| 2025 | 8,641 |
Neighboring counties
- Marquette County west · 68,064 people
- Schoolcraft County southeast · 8,187 people
- Luce County east · 6,339 people
- Keweenaw County northwest · 2,186 people
- Delta County south · 36,582 people
Printable Alger 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) (135 KB)
- PNG (2400 px) (72 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.
Back to the Michigan county map with all 83 counties. Found an error? Tell us.