Marietta is located in central Cobb County, Georgia, United States, and is the county's seat and largest city.
As of the 2010 census, the city had a total population of 56,579. The 2019 estimate is 60,867, making it one of Atlanta's largest suburbs. Marietta is the fourth largest of the principal cities (by population) of the Atlanta metropolitan area.
The origin of the name is uncertain. It is believed that the city was named for Mary Cobb, the wife of U.S. Senator and Superior Court judge Thomas Willis Cobb. Judge Cobb is the namesake of the county.
Homes were built by early settlers near the Cherokee town of Big Shanty (now Kennesaw) prior to 1824. The first plot was laid out in 1833. Like most towns, Marietta had a square (see Marietta Square) in the center with a courthouse. The Georgia General Assembly legally recognized the community on December 19, 1834.
Built-in 1838, Oakton House is the oldest continuously occupied residence in Marietta. The original barn, milk house, smokehouse, and well house remain on the property.