Fairburn, GA has a population of 13,860 and is the 3,019th largest city in the United States. The population density is 819 per sq mi which is 391% higher than the Georgia average and 804% higher than the national average. The median age in Fairburn is 32 which is approximately 12% lower than the Georgia average of 36. In Fairburn, 41% of the population over 15 years of age are married, 88% speak English and 9% speak Spanish. 54% of Fairburn residents were born in Georgia, 37% were born out of state, 1% were born outside of the United States and 7% were foreign born.