atlanta | ispartof | dekalb_county_georgia <tsp> atlanta | country | united_states <tsp> atlanta | ispartof | 'georgia' <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 
most of atlanta is part of dekalb county in georgia.united states.atlanta is the capital and most populous city of the united states georgia