Getting started with auto dealers license in Georgia, Atlanta city. Atlanta is the capital and most populous city in the U.S. state of Georgia. According to the 2010 census, the population of Atlanta is 420003. Atlanta is the cultural and economic center of the metro Atlanta area, with a population of 5,268,860 people and is the ninth largest metropolitan area in the U.S. is the county seat of Fulton County Atlanta, and a small part of the city extends east of DeKalb County. Residents of the city and its environs are known as “Atlantans.