Marietta is a city located in Cobb County Georgia. It is also the county seat of Cobb County. With a 2020 population of 61,307, it is the 14th largest city in Georgia and the 625th largest city in the United States . Marietta is currently growing at a rate of 0.36% annually and its population has increased by 8.36% since the most recent census, which recorded a population of 56,579 in 2010. Marietta reached it's highest population of 61,307 in 2021. Spanning over 23 miles, Marietta has a population density of 2,619 people per square mile.
The average household income in Marietta is $85,402 with a poverty rate of 14.01%. The median rental costs in recent years comes to $1,102 per month, and the median house value is $287,600. The median age in Marietta is 34.9 years, 33.6 years for males, and 36.5 years for females.