Millen, GA has a population of 2,972 and is the 8,870th largest city in the United States. The population density is 830 per sq mi which is 397% higher than the Georgia average and 816% higher than the national average. The median age in Millen is 47 which is approximately 28% higher than the Georgia average of 36. In Millen, 53% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 89% of Millen residents were born in Georgia, 11% were born out of state, 0% were born outside of the United States and 0% were foreign born.