County Maps US

Clinton County, Ohio

A county in Ohio, ranked 58 of 88 by population.

CountyFIPS 39027

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

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Population
42,301
+266 (+0.6%) since 2020
Land area
408.7
square miles. A further 0.9% of the total area is water
Population density
103
people per square mile, computed rather than published
County seat
Wilmington
Seat of county government.
Established
1810
215 years ago
Largest city
Wilmington city
Population 12,802.

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 Clinton 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 Clinton 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 772 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 Clinton 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
Population42,30158th of 881,149th of 3,144
Land area408.7 sq mi64th of 882,471st of 3,144
Population density103 per sq mi52nd of 88884th of 3,144
Median household income$70,40738th of 881,169th of 3,143

Full data for Clinton County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population42,301Vintage 2025 Population Estimates
Population in 202042,035Vintage 2025 Population Estimates
2020 estimates base?42,026Vintage 2025 Population Estimates
Land area408.7 sq mi2025 Gazetteer Files
Water area3.6 sq mi2025 Gazetteer Files
Total area412.3 sq mi2025 Gazetteer Files
Population density?103 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$70,407American Community Survey 2020-2024 5-Year Estimates
Median home value$211,900American Community Survey 2020-2024 5-Year Estimates
Median age40.8American Community Survey 2020-2024 5-Year Estimates
Households16,761American Community Survey 2020-2024 5-Year Estimates
Housing units18,039American 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
+2
463 births, 461 deaths
Net migration
+253
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 Clinton 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
Warren CountyOhio22 mi257,181
Highland CountyOhio21 mi43,823
Fayette CountyOhio16 mi28,552
Greene CountyOhio16 mi174,322
Brown CountyOhio6.7 mi44,397
Clermont CountyOhio0.9 mi216,977

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.