County Maps US

Washington County, Ohio

A county in Ohio, ranked 44 of 88 by population.

CountyFIPS 39167

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

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Population
58,389
-1,268 (-2.1%) since 2020
Land area
632.2
square miles. A further 1.2% of the total area is water
Population density
92.4
people per square mile, computed rather than published
County seat
Marietta
Seat of county government.
Established
1788
237 years ago
Largest city
Marietta city
Population 13,053.

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 Washington 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 Washington 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 573 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 Washington 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
Population58,38944th of 88913th of 3,144
Land area632.2 sq mi5th of 881,514th of 3,144
Population density92.4 per sq mi59th of 88970th of 3,144
Median household income$63,60355th of 881,743rd of 3,143

Full data for Washington County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population58,389Vintage 2025 Population Estimates
Population in 202059,657Vintage 2025 Population Estimates
2020 estimates base?59,773Vintage 2025 Population Estimates
Land area632.2 sq mi2025 Gazetteer Files
Water area8.0 sq mi2025 Gazetteer Files
Total area640.1 sq mi2025 Gazetteer Files
Population density?92.4 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$63,603American Community Survey 2020-2024 5-Year Estimates
Median home value$185,600American Community Survey 2020-2024 5-Year Estimates
Median age44.0American Community Survey 2020-2024 5-Year Estimates
Households24,779American Community Survey 2020-2024 5-Year Estimates
Housing units27,949American 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
-256
558 births, 814 deaths
Net migration
+42
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 Washington 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
Wood CountyWest Virginia32 mi82,385
Morgan CountyOhio26 mi13,626
Noble CountyOhio25 mi14,276
Athens CountyOhio23 mi63,197
Monroe CountyOhio18 mi12,994
Pleasants CountyWest Virginia17 mi7,338
Tyler CountyWest Virginia7.5 mi7,881

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.