County Maps US

Ontonagon County, Michigan

A county in Michigan, ranked 82 of 83 by population.

CountyFIPS 26131

Within Michigan
Ontonagon County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Ontonagon, the county seat, located via the 2025 Census Gazetteer.

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Population
5,823
+24 (+0.4%) since 2020
Land area
1,311
square miles. A further 65.0% of the total area is water
Population density
4.4
people per square mile, computed rather than published
County seat
Ontonagon
Seat of county government.
Established
1843
182 years ago
Largest city
Ontonagon village
Population 1,264.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Ontonagon County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Ontonagon County, Michigan from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 798 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Ontonagon County ranks

Position among the 83 counties of Michigan, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MichiganNationally
Population5,82382nd of 832,746th of 3,144
Land area1,311 sq mi3rd of 83455th of 3,144
Population density4.4 per sq mi82nd of 832,793rd of 3,144
Median household income$54,39875th of 832,510th of 3,143

Full data for Ontonagon County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population5,823Vintage 2025 Population Estimates
Population in 20205,799Vintage 2025 Population Estimates
2020 estimates base?5,807Vintage 2025 Population Estimates
Land area1,311 sq mi2025 Gazetteer Files
Water area2,429 sq mi2025 Gazetteer Files
Total area3,740 sq mi2025 Gazetteer Files
Population density?4.4 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$54,398American Community Survey 2020-2024 5-Year Estimates
Median home value$111,700American Community Survey 2020-2024 5-Year Estimates
Median age59.8American Community Survey 2020-2024 5-Year Estimates
Households3,149American Community Survey 2020-2024 5-Year Estimates
Housing units5,238American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-68
27 births, 95 deaths
Net migration
+27
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Ontonagon County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Gogebic CountyMichigan100 mi14,285
Houghton CountyMichigan82 mi37,842
Keweenaw CountyMichigan38 mi2,186
Cook CountyMinnesota32 mi5,522
Ashland CountyWisconsin19 mi16,203
Iron CountyMichigan6.0 mi11,757

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 83 counties of Michigan

Open the interactive Michigan county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.