County Maps US

Adams County, Ohio

A county in Ohio, ranked 76 of 88 by population.

CountyFIPS 39001

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

Download SVGFull Ohio map downloads

Population
27,865
+414 (+1.5%) since 2020
Land area
583.9
square miles. A further 0.4% of the total area is water
Population density
47.7
people per square mile, computed rather than published
County seat
West Union
Seat of county government.
Established
1797
228 years ago
Largest city
West Union village
Population 3,091.

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 Adams 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 Adams 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 617 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 Adams 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
Population27,86576th of 881,514th of 3,144
Land area583.9 sq mi10th of 881,685th of 3,144
Population density47.7 per sq mi82nd of 881,521st of 3,144
Median household income$50,26487th of 882,760th of 3,143

Full data for Adams County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population27,865Vintage 2025 Population Estimates
Population in 202027,451Vintage 2025 Population Estimates
2020 estimates base?27,481Vintage 2025 Population Estimates
Land area583.9 sq mi2025 Gazetteer Files
Water area2.4 sq mi2025 Gazetteer Files
Total area586.3 sq mi2025 Gazetteer Files
Population density?47.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$50,264American Community Survey 2020-2024 5-Year Estimates
Median home value$164,200American Community Survey 2020-2024 5-Year Estimates
Median age42.1American Community Survey 2020-2024 5-Year Estimates
Households10,421American Community Survey 2020-2024 5-Year Estimates
Housing units12,733American 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
-52
326 births, 378 deaths
Net migration
+276
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 Adams 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
Scioto CountyOhio27 mi71,365
Lewis CountyKentucky27 mi12,901
Brown CountyOhio26 mi44,397
Highland CountyOhio16 mi43,823
Pike CountyOhio7.9 mi27,061
Mason CountyKentucky3.7 mi16,936

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.