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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 2018 estimate is 60,806, making it one of Atlanta's largest suburbs. Marietta is the fourth largest of the principal cities (by population) of the Atlanta metropolitan area.
As of the census of 2010, there were 56,641 people, and 22,261 households. The population density was 2,684.1 people per square mile (1,036.2/km²).
There were 23,895 households out of which 27.8% had children under 18 living with them, 35.4% were married couples living together, 13.8% had a female householder with no husband present, and 45.5% were non-families. 32.8% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older. The average household size was 2.39, and the average family size was 3.05.
In the city, the population was distributed by age with 22.4% under the age of 18, 14.1% from 18 to 24, 39.4% from 25 to 44, 15.7% from 45 to 64, and 8.3% who were 65 years of age or older. The median age was 30 years. For every 100 females, there were 101.3 males. For every 101 females age 18 and over, there were 100.3 males.