Founded in Apr 30, 1803, Gallia County is one of 88 counties in the state of Ohio. Historically, Gallia County was formed from Washington and Adams Counties. The city of Gallipolis is the county seat. With FIPS code of 53, Gallia County has a population of 29,158 and area of 468.78 square miles (1,214 km2).
List of all cities in Gallia County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Bidwell, OH | 45614 | 740 |
| Cheshire, OH | 45620 | 740 |
| Crown City, OH | 45623 | 740 |
| Ewington, OH | 45686 | 740 |
| Gallipolis, OH | 45631 | 740 |
| Kerr, OH | 45643 | 740 |
| Northup, OH | 45658 | 740 |
| Patriot, OH | 45658 | 740 |
| Rio Grande, OH | 45674 | 740 |
| Rodney, OH | 45631 | 740 |
| Thurman, OH | 45685 | 740 |
| Vinton, OH | 45686 | 740 |