Austell, GA has a population of 7,056 and is the 5,148th largest city in the United States. The population density is 1,174 per sq mi which is 603% higher than the Georgia average and 1196% higher than the national average. The median age in Austell is 35 which is approximately 3% lower than the Georgia average of 36. In Austell, 51% of the population over 15 years of age are married, 79% speak English and 15% speak Spanish. 46% of Austell residents were born in Georgia, 36% were born out of state, 2% were born outside of the United States and 16% were foreign born.