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As of the 2000 census, the city had a total population of 58,748, making it one of metro Atlanta's largest suburbs. Census estimates of 2007 indicate a population of 67,021. Marietta is the third-largest of three principal cities (by population) of and is included in the Atlanta-Sandy Springs-Marietta, Georgia metropolitan statistical area, which is included in the Atlanta-Sandy Springs-Gainesville, Georgia-Alabama (part) combined statistical area.
In 2008, the mayor of Marietta was Bill Dunaway.
According to the United States Census Bureau, the city has a total area of 22.0 square miles (56.9 km²), of which, 21.9 square miles (56.7 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.27%) is water.