County Maps US

Belmont County, Ohio

A county in Ohio, ranked 38 of 88 by population.

CountyFIPS 39013

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

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Population
64,434
-1,851 (-2.8%) since 2020
Land area
532.2
square miles. A further 1.7% of the total area is water
Population density
121
people per square mile, computed rather than published
County seat
St. Clairsville
Seat of county government.
Established
1801
224 years ago
Largest city
Martins Ferry city
Population 6,048.

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 Belmont 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 Belmont 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 649 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 Belmont 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
Population64,43438th of 88850th of 3,144
Land area532.2 sq mi18th of 881,963rd of 3,144
Population density121 per sq mi44th of 88794th of 3,144
Median household income$57,01776th of 882,329th of 3,143

Full data for Belmont County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population64,434Vintage 2025 Population Estimates
Population in 202066,285Vintage 2025 Population Estimates
2020 estimates base?66,495Vintage 2025 Population Estimates
Land area532.2 sq mi2025 Gazetteer Files
Water area9.1 sq mi2025 Gazetteer Files
Total area541.3 sq mi2025 Gazetteer Files
Population density?121 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$57,017American Community Survey 2020-2024 5-Year Estimates
Median home value$154,900American Community Survey 2020-2024 5-Year Estimates
Median age44.1American Community Survey 2020-2024 5-Year Estimates
Households27,195American Community Survey 2020-2024 5-Year Estimates
Housing units31,522American 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
-484
380 births, 864 deaths
Net migration
+152
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 Belmont 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
Monroe CountyOhio22 mi12,994
Harrison CountyOhio19 mi14,070
Marshall CountyWest Virginia18 mi29,159
Guernsey CountyOhio15 mi38,379
Jefferson CountyOhio9.9 mi63,597
Ohio CountyWest Virginia9.7 mi40,496
Noble CountyOhio5.8 mi14,276

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.