Gallipolis ( ) is a chartered village in the U.S. state of Ohio and the county seat of Gallia County. The municipality is located in Southeast Ohio along the Ohio River about 55 miles southeast of Chillicothe and 44 miles northwest of Charleston, West Virginia. The population was 3,641 at the 2010 census. When the population dropped below 5,000, Gallipolis lost its city status and was classified as a village under state law. It continues to operate its government under its existing city charter.