Stone Mountain is a city in DeKalb County, Georgia, United States. The population was 6,703 according to the 2020 US Census. Stone Mountain is in the eastern part of DeKalb County and is a suburb of Atlanta that encompasses nearly 1.7 square miles. It lies near and touches the western base of the geological formation of the same name. Locals often call the city "Stone Mountain Village" to distinguish it from the larger unincorporated area traditionally considered Stone Mountain and Stone Mountain Park.

DeKalb County is located in the north central portion of the U.S. state of Georgia. As of the 2020 census, the population was 764,382, making it Georgia's fourth-most populous county. Its county seat is Decatur.