Graysville is an unincorporated community in Catoosa County, in the U.S. state of Georgia. It is part of the Chattanooga, Tennessee–GA Metropolitan Statistical Area.Graysville is located about one mile south of the Georgia-Tennessee border. South Chickamauga Creek flows past the southwest side of the community.A post office has been in operation in Graysville since 1856. The community was named for John D. Gray, a railroad official.