Mableton is a town in Cobb County, Georgia, United States. As of the 2010 census, Mableton had a population of 37,115. When Brookhaven became a city in December 2012, Mableton became the largest unincorporated community in Metro Atlanta.
It was named for Robert Mable, who on September 11, 1843, bought 300 acres (approximately 120 hectares or 1.2 km²) of land. The Southern Railway opened a railroad station in Mableton in December 1881, and on June 28, 1882, the post office opened replacing the Bryantville post office about two miles (3.2 km) southeast. On August 19, 1912, Mableton was incorporated as a town but was disincorporated on August 17, 1916. The Robert Mable House and Cemetery, located off U.S. 78 on Floyd Road just north of Clay Road, now includes an amphitheater which hosts public events.
Roy Barnes, governor of Georgia from 1999 to 2003, is from Mableton.
Mableton is located at 33°48′48″N 84°34′18″W (33.813355, -84.571691).
According to the United States Census Bureau, the CDP has a total area of 20.8 square miles (54 km2), of which 20.6 square miles (53 km2) is land and 0.2 square miles (0.52 km2), or 0.82%, is water.
As of the census of 2010, there were 37,115 people in Mableton.
As of the census of 2000, there were 29,733 people, 10,894 households, and 7,963 families residing in the CDP. The population density was 1,444.4 people per square mile (557.6/km²). There were 11,339 housing units at an average density of 550.8/sq mi (212.6/km²).