County Maps US

Mahoning County, Ohio

A county in Ohio, ranked 13 of 88 by population.

CountyFIPS 39099

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

Download SVGFull Ohio map downloads

Population
224,706
-3,300 (-1.4%) since 2020
Land area
411.5
square miles. A further 3.2% of the total area is water
Population density
546
people per square mile, computed rather than published
County seat
Youngstown
Seat of county government.
Established
1846
179 years ago
Largest city
Youngstown city
Population 58,831 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 Mahoning 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 Mahoning County, Ohio 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 477 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 Mahoning County ranks

Position among the 88 counties of Ohio, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn OhioNationally
Population224,70613th of 88319th of 3,144
Land area411.5 sq mi61st of 882,457th of 3,144
Population density546 per sq mi12th of 88264th of 3,144
Median household income$56,94277th of 882,334th of 3,143

Full data for Mahoning County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population224,706Vintage 2025 Population Estimates
Population in 2020228,006Vintage 2025 Population Estimates
2020 estimates base?228,605Vintage 2025 Population Estimates
Land area411.5 sq mi2025 Gazetteer Files
Water area13.7 sq mi2025 Gazetteer Files
Total area425.2 sq mi2025 Gazetteer Files
Population density?546 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$56,942American Community Survey 2020-2024 5-Year Estimates
Median home value$154,700American Community Survey 2020-2024 5-Year Estimates
Median age43.2American Community Survey 2020-2024 5-Year Estimates
Households98,065American Community Survey 2020-2024 5-Year Estimates
Housing units107,990American 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
-959
2,285 births, 3,244 deaths
Net migration
+887
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 Mahoning 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
Columbiana CountyOhio34 mi99,377
Trumbull CountyOhio25 mi198,972
Lawrence CountyPennsylvania16 mi83,911
Portage CountyOhio15 mi163,404
Stark CountyOhio6.0 mi373,771
Mercer CountyPennsylvania0.6 mi107,860

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

All 88 counties of Ohio

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

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