Atlanta ( or ) is the capital and the most populous city of the state of Georgia, and the core city of the ninth most populous metropolitan area in the United States. It is the county seat of Fulton County, although portions of the city extend into DeKalb County. As of July 2006, the city of Atlanta had a population of 486,411 and a metropolitan population of 5,138,223. The July 2006 census estimate put the combined statistical area (CSA) population at 5,478,667. Residents of the city are known as Atlantans.