City highlighted in  Fulton County , location of Fulton County in the  state of Georgia Coordinates:  33°45′18″N   84°23′24″W Country United States of America State Georgia County Fulton  and  DeKalb Terminus 1837 Marthasville 1843 City of Atlanta 1847 Government  -  Mayor Kasim Reed Area  -  City 132.4 sq mi ( 343.0