The Atlanta Regional Commission (ARC) is the regional planning and intergovernmental coordination agency for the metro Atlanta, Georgia, USA region, defined as the 10-county area of Cherokee, Clayton, Cobb, DeKalb, Douglas, Fayette, Fulton, Gwinnett, Henry and Rockdale counties, including the city of Atlanta. It also serves as the metropolitan planning organization for those and ten more counties in the region: Barrow, Bartow, Carroll, Coweta, Forsyth, Hall, Newton, Paulding, Spalding, and Walton counties.
ARC and its predecessor agencies have coordinated the planning efforts in the region since 1947, when the first publicly supported, multi-county planning agency in the United States was created. At that time, the Metropolitan Planning Commission (MPC) served DeKalb and Fulton counties and the city of Atlanta (which is already in both of those counties). Since then, ARC membership has grown to its current size of 10 counties and 63 municipalities.