North Decatur, GA has a population of 16,652 and is the 2,567th largest city in the United States. The population density is 3,391 per sq mi which is 1931% higher than the Georgia average and 3643% higher than the national average. The median age in North Decatur is 40 which is approximately 11% higher than the Georgia average of 36. In North Decatur, 45% of the population over 15 years of age are married, 83% speak English and 4% speak Spanish. 40% of North Decatur residents were born in Georgia, 43% were born out of state, 2% were born outside of the United States and 15% were foreign born.