Gallia County area

Population and density of Gallia County

The Census Bureau estimates that 29,072 people lived in Gallia County on July 1, 2025. That ranks #1,516 of 3,222 county equivalents nationally and #73 of 88 in Ohio. Since the April 1, 2020 estimates base of 29,210, the population has declined by 138 (−0.5%), compared with +0.9% for Ohio as a whole.

With 466.5 square miles of land, that is 62 people per square mile (24 per km²), placing Gallia County #1,360 nationally for density and #78 in Ohio. The median county equivalent has 47 people per square mile; the Ohio median is 120. Put another way, there are about 10 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Gallia County

6 incorporated places lie at least partly in Gallia County. Together they are home to 5,008 people (17.2%); the other 24,064 (82.8%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Gallipolis village, with 3,318 residents in the county.

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Gallia County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Gallia County is a central county of the Gallipolis, OH Micropolitan Statistical Area. Gallia County is the area’s only county equivalent, so the micro area has the same 466.5 square miles of land. By combined land it ranks #451 of 542 micropolitan areas, and #447 by population.

ZIP codes

12 ZIP Code Tabulation Areas have land in Gallia County; 7 of them have most of their land inside the county, and the others mainly cover neighboring areas.

456144562045623456314565645658456744567845685456864568845760

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Gallia County

Gallia County shares a land border with 6 county equivalents, including 2 in West Virginia. It has more land than every one of them. The largest neighbor is Lawrence County (453.4 mi²) and the smallest is Cabell County (281 mi²). Together with its neighbors, Gallia County forms a block of 2,893.9 mi² of land, of which it holds 16.1%.

How big is Gallia County compared with U.S. states?

Gallia County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.2 times as much. Ohio’s county land could hold about 88 areas the size of Gallia County.

Another way to picture it: the same land area would fill a square about 21.6 miles (34.8 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Gallia County?

Gallia County has more land than 1,015 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Gallia County at #2,276 nationally by total area, 69 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 1%, compared with a national county-equivalent median of 1.2% — 0.2 percentage points lower. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Gallia County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.