Marietta, GA has a population of 59,714 and is the 652nd largest city in the United States. The population density is 2,559 per sq mi which is 1433% higher than the Georgia average and 2724% higher than the national average. The median age in Marietta is 34 which is approximately 6% lower than the Georgia average of 36. In Marietta, 46% of the population over 15 years of age are married, 73% speak English and 19% speak Spanish. 37% of Marietta residents were born in Georgia, 42% were born out of state, 1% were born outside of the United States and 20% were foreign born.