County Maps US

Gallia County, Ohio

A county in Ohio, ranked 73 of 88 by population.

CountyFIPS 39053

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

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Population
29,072
-154 (-0.5%) since 2020
Land area
466.5
square miles. A further 1.0% of the total area is water
Population density
62.3
people per square mile, computed rather than published
County seat
Gallipolis
Seat of county government.
Established
1803
222 years ago
Largest city
Gallipolis village
Population 3,318.

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 Gallia 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 Gallia 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 685 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 Gallia 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
Population29,07273rd of 881,475th of 3,144
Land area466.5 sq mi35th of 882,207th of 3,144
Population density62.3 per sq mi78th of 881,282nd of 3,144
Median household income$56,83078th of 882,346th of 3,143

Full data for Gallia County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population29,072Vintage 2025 Population Estimates
Population in 202029,226Vintage 2025 Population Estimates
2020 estimates base?29,210Vintage 2025 Population Estimates
Land area466.5 sq mi2025 Gazetteer Files
Water area4.7 sq mi2025 Gazetteer Files
Total area471.2 sq mi2025 Gazetteer Files
Population density?62.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$56,830American Community Survey 2020-2024 5-Year Estimates
Median home value$155,600American Community Survey 2020-2024 5-Year Estimates
Median age41.4American Community Survey 2020-2024 5-Year Estimates
Households11,614American Community Survey 2020-2024 5-Year Estimates
Housing units13,464American 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
-66
333 births, 399 deaths
Net migration
+183
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 Gallia 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
Mason CountyWest Virginia35 mi24,707
Lawrence CountyOhio34 mi55,710
Jackson CountyOhio20 mi32,817
Meigs CountyOhio16 mi21,587
Vinton CountyOhio6.1 mi12,645
Cabell CountyWest Virginia4.7 mi91,183

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.