County Maps US

Darke County, Ohio

A county in Ohio, ranked 49 of 88 by population.

CountyFIPS 39037

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

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Population
51,520
-381 (-0.7%) since 2020
Land area
598.1
square miles. A further 0.3% of the total area is water
Population density
86.1
people per square mile, computed rather than published
County seat
Greenville
Seat of county government.
Established
1809
216 years ago
Largest city
Greenville city
Population 12,680.

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 Darke 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 Darke 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 568 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 Darke 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
Population51,52049th of 88992nd of 3,144
Land area598.1 sq mi9th of 881,631st of 3,144
Population density86.1 per sq mi66th of 881,027th of 3,144
Median household income$64,48652nd of 881,670th of 3,143

Full data for Darke County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population51,520Vintage 2025 Population Estimates
Population in 202051,901Vintage 2025 Population Estimates
2020 estimates base?51,887Vintage 2025 Population Estimates
Land area598.1 sq mi2025 Gazetteer Files
Water area1.6 sq mi2025 Gazetteer Files
Total area599.7 sq mi2025 Gazetteer Files
Population density?86.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$64,486American Community Survey 2020-2024 5-Year Estimates
Median home value$173,200American Community Survey 2020-2024 5-Year Estimates
Median age41.8American Community Survey 2020-2024 5-Year Estimates
Households21,297American Community Survey 2020-2024 5-Year Estimates
Housing units22,651American 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
+17
606 births, 589 deaths
Net migration
+56
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 8 areas bordering Darke 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
Randolph CountyIndiana21 mi24,438
Mercer CountyOhio20 mi42,737
Miami CountyOhio19 mi112,634
Preble CountyOhio17 mi40,664
Shelby CountyOhio11 mi48,065
Wayne CountyIndiana6.1 mi66,169
Montgomery CountyOhio3.2 mi539,598
Jay CountyIndiana2.9 mi20,118

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.