Grantville, GA has a population of 3,151 and is the 8,565th largest city in the United States. The population density is 544 per sq mi which is 226% higher than the Georgia average and 500% higher than the national average. The median age in Grantville is 32 which is approximately 11% lower than the Georgia average of 36. In Grantville, 57% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 71% of Grantville residents were born in Georgia, 23% were born out of state, 1% were born outside of the United States and 5% were foreign born.