Stone Mountain is a city in eastern DeKalb County, Georgia, United States. The population was 5,802 at the 2010 census. It is an outer suburb of the Atlanta Metropolitan Area. The town is named for nearby Stone Mountain. The mountain has contributed to the city's economy both through its continuing status as a tourist attraction and its former use as a granite quarry. It is also the site of a famous giant carving commemorating the military leaders of the Confederacy as well as a state park and museum, including a tourist railroad.According to the United States Census Bureau, the city has a total area of 1.6 square miles (4.1 km2), of which 0.62% is water.While the city of Stone Mountain itself is in DeKalb County, some of the town's mailing addresses are in Gwinnett County.
In 1822 the area that now makes up the city of Stone Mountain was made a part of the newly formed DeKalb County. A post office was created in 1834 on the old Augusta Road, and Andrew Johnson built a hotel along the road in 1836. At around the same time, Aaron Cloud built an observation tower at the summit of the mountain. Visitors to the mountain would travel to the area by rail and road, and then walk up the 1.1-mile (1.8 km) mountaintop trail to the top, where Cloud also had a restaurant and club.