County Maps US

Ingham County, Michigan

A county in Michigan, ranked 8 of 83 by population.

CountyFIPS 26065

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

Download SVGFull Michigan map downloads

Population
289,709
+4,704 (+1.7%) since 2020
Land area
556.1
square miles. A further 0.8% of the total area is water
Population density
521
people per square mile, computed rather than published
County seat
Mason
Seat of county government.
Established
1838
187 years ago
Largest city
Lansing city
Population 108,771 for the whole place, which extends beyond this county.

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 Ingham 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 Ingham 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 771 by 800 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 Ingham 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
Population289,7098th of 83253rd of 3,144
Land area556.1 sq mi56th of 831,865th of 3,144
Population density521 per sq mi8th of 83273rd of 3,144
Median household income$65,52633rd of 831,591st of 3,143

Full data for Ingham County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population289,709Vintage 2025 Population Estimates
Population in 2020285,005Vintage 2025 Population Estimates
2020 estimates base?285,228Vintage 2025 Population Estimates
Land area556.1 sq mi2025 Gazetteer Files
Water area4.6 sq mi2025 Gazetteer Files
Total area560.7 sq mi2025 Gazetteer Files
Population density?521 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$65,526American Community Survey 2020-2024 5-Year Estimates
Median home value$198,800American Community Survey 2020-2024 5-Year Estimates
Median age33.3American Community Survey 2020-2024 5-Year Estimates
Households117,096American Community Survey 2020-2024 5-Year Estimates
Housing units126,232American 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
+185
2,683 births, 2,498 deaths
Net migration
+2,108
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 5 areas bordering Ingham 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
Livingston CountyMichigan24 mi197,315
Eaton CountyMichigan24 mi109,581
Jackson CountyMichigan24 mi159,552
Clinton CountyMichigan13 mi80,432
Shiawassee CountyMichigan10 mi67,681

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.