Lithonia, GA has a population of 2,093 and is the 10,745th largest city in the United States. The population density is 2,256 per sq mi which is 1106% higher than the Georgia average and 2390% higher than the national average. The median age in Lithonia is 29 which is approximately 20% lower than the Georgia average of 36. In Lithonia, 31% of the population over 15 years of age are married, 90% speak English and 7% speak Spanish. 69% of Lithonia residents were born in Georgia, 25% were born out of state, 1% were born outside of the United States and 5% were foreign born.