County Maps US

Clark County, Ohio

A county in Ohio, ranked 21 of 88 by population.

CountyFIPS 39023

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

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Population
135,340
-548 (-0.4%) since 2020
Land area
395.9
square miles. A further 1.4% of the total area is water
Population density
342
people per square mile, computed rather than published
County seat
Springfield
Seat of county government.
Established
1818
207 years ago
Largest city
Springfield city
Population 58,281.

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 Clark 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 Clark 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 553 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 Clark 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
Population135,34021st of 88490th of 3,144
Land area395.9 sq mi83rd of 882,546th of 3,144
Population density342 per sq mi17th of 88392nd of 3,144
Median household income$63,13257th of 881,781st of 3,143

Full data for Clark County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population135,340Vintage 2025 Population Estimates
Population in 2020135,888Vintage 2025 Population Estimates
2020 estimates base?135,975Vintage 2025 Population Estimates
Land area395.9 sq mi2025 Gazetteer Files
Water area5.6 sq mi2025 Gazetteer Files
Total area401.5 sq mi2025 Gazetteer Files
Population density?342 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$63,132American Community Survey 2020-2024 5-Year Estimates
Median home value$169,900American Community Survey 2020-2024 5-Year Estimates
Median age41.2American Community Survey 2020-2024 5-Year Estimates
Households55,975American Community Survey 2020-2024 5-Year Estimates
Housing units61,126American 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
-195
1,639 births, 1,834 deaths
Net migration
-627
More people moved out than moved in.

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

The 5 areas bordering Clark 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
Champaign CountyOhio28 mi38,820
Greene CountyOhio25 mi174,322
Madison CountyOhio20 mi46,985
Miami CountyOhio11 mi112,634
Montgomery CountyOhio2.0 mi539,598

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.