County Maps US

Ohio County, Kentucky

A county in Kentucky, ranked 49 of 120 by population.

CountyFIPS 21183

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

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Population
23,934
+187 (+0.8%) since 2020
Land area
587.1
square miles. A further 1.5% of the total area is water
Population density
40.8
people per square mile, computed rather than published
County seat
Hartford
Seat of county government.
Established
1798
227 years ago
Largest city
Beaver Dam city
Population 3,537.

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 Ohio 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 Ohio County, Kentucky 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 691 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 Ohio County ranks

Position among the 120 counties of Kentucky, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn KentuckyNationally
Population23,93449th of 1201,653rd of 3,144
Land area587.1 sq mi5th of 1201,671st of 3,144
Population density40.8 per sq mi84th of 1201,657th of 3,144
Median household income$57,79859th of 1202,274th of 3,143

Full data for Ohio County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population23,934Vintage 2025 Population Estimates
Population in 202023,747Vintage 2025 Population Estimates
2020 estimates base?23,770Vintage 2025 Population Estimates
Land area587.1 sq mi2025 Gazetteer Files
Water area9.1 sq mi2025 Gazetteer Files
Total area596.2 sq mi2025 Gazetteer Files
Population density?40.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$57,798American Community Survey 2020-2024 5-Year Estimates
Median home value$121,400American Community Survey 2020-2024 5-Year Estimates
Median age40.5American Community Survey 2020-2024 5-Year Estimates
Households9,107American Community Survey 2020-2024 5-Year Estimates
Housing units10,241American 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
-62
232 births, 294 deaths
Net migration
+94
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 7 areas bordering Ohio 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
Muhlenberg CountyKentucky32 mi30,634
Butler CountyKentucky28 mi12,520
Daviess CountyKentucky25 mi104,898
Grayson CountyKentucky23 mi27,406
McLean CountyKentucky15 mi9,064
Hancock CountyKentucky11 mi9,050
Breckinridge CountyKentucky8.3 mi21,503

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

All 120 counties of Kentucky

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

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