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.