Atlanta, IL has a population of 1,415 and is the 13,039th largest city in the United States. The population density is 1,120 per sq mi which is 404% higher than the Illinois average and 1136% higher than the national average. The median age in Atlanta is 40 which is approximately 6% higher than the Illinois average of 37. In Atlanta, 69% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 85% of Atlanta residents were born in Illinois, 12% were born out of state, 0% were born outside of the United States and 2% were foreign born.