Thomaston, GA has a population of 8,976 and is the 4,273rd largest city in the United States. The population density is 942 per sq mi which is 464% higher than the Georgia average and 939% higher than the national average. The median age in Thomaston is 36 which is approximately 1% lower than the Georgia average of 36. In Thomaston, 47% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 84% of Thomaston residents were born in Georgia, 14% were born out of state, 1% were born outside of the United States and 1% were foreign born.