Barnesville, GA has a population of 6,611 and is the 5,385th largest city in the United States. The population density is 1,090 per sq mi which is 553% higher than the Georgia average and 1103% higher than the national average. The median age in Barnesville is 29 which is approximately 20% lower than the Georgia average of 36. In Barnesville, 37% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 85% of Barnesville residents were born in Georgia, 12% were born out of state, 1% were born outside of the United States and 2% were foreign born.