what county is mableton ga in
Mableton, Georgia. Homefacts City Report. Mableton is located in Cobb County, GA. The population is 40,122, making Mableton the 3rd largest city in Cobb County. There are 10 public schools in Mableton with an average Homefacts rating of C. The total crime rate for Mableton is low, and there are 48 registered sex offenders residing in the city.