atlanta | areacode | 404, 678, 470 <tsp> atlanta | areaofland | 3449 (square kilometres) <tsp> atlanta | populationdensity | 12990 (inhabitants per square kilometre) <tsp> atlanta | ispartof | fulton_county,_georgia <tsp> atlanta | areatotal | 3471 (square kilometres) <sep> atlanta ( at-lan-tə) is the capital and most populous city of the us state of georgia it is the seat of fulton county, the most populous county in georgia, although a portion of the city extends into neighboring dekalb county with a population of 498,715 living within the city limits, it is the eighth most populous city in the southeast and 38th most populous city in the united states according to the 2020 us census 
part of fulton county (georgia). atlanta has a population density of. 1299.0 inhabitants per square kilometre. atlanta has a total area of 347.1 square kilometres. yet covers an area of 344.9 square kilometres. atlanta has the area codes 404. 678. and 470.atlanta is the capital and most populous city of the u.s. state of georgia