Gallia County's 2026 population is estimated at 29,188, reflecting a 0.4% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Gallia County is the 73rd largest county in Ohio. The 2010 population was 31,066 and has grown -6.05% since 2010.
Overall: 41.4 years
Female: 42.3 years
Male: 40 years
There are 22,211 adults, (5,790 of whom are seniors) in Gallia County.
Female: 14,812 (51%)
Male: 14,256 (49%)
The racial composition of Gallia County includes 92.93% White, and smaller percentages for Two or more races, Black or African American, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 27,012 | 92.93% |
| Two or more races | 862 | 2.97% |
| Black or African American | 590 | 2.03% |
| Other race | 332 | 1.14% |
| Asian | 237 | 0.82% |
| Native American | 34 | 0.12% |
| Native Hawaiian or Pacific Islander | 1 | 0% |
Gallia County 's average per capita income is $43,772. Household income levels show a median of $56,830. The poverty rate stands at 16.44%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $87,254 | - |
| Families | $72,465 | $92,413 |
| Households | $56,830 | $77,972 |
| Non Families | $28,416 | $45,739 |
Average Income
Median Household Income
Poverty Rate