Buchanan, GA has a population of 1,367 and is the 13,235th largest city in the United States. The population density is 918 per sq mi which is 450% higher than the Georgia average and 913% higher than the national average. The median age in Buchanan is 33 which is approximately 9% lower than the Georgia average of 36. In Buchanan, 46% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 76% of Buchanan residents were born in Georgia, 23% were born out of state, 0% were born outside of the United States and 1% were foreign born.