Atlanta is the capital and most populous city in the U.S. state of Georgia. With an estimated 2018 population of 498,044, it is also the 37th most-populous city in the United States. The city serves as the cultural and economic center of the Atlanta metropolitan area, home to 5.9 million people and the ninth-largest metropolitan area in the nation. Atlanta is the seat of Fulton County, the most populous county in Georgia. Portions of the city extend eastward into neighboring DeKalb County.