Grantville is a city in Coweta County, Georgia, United States. The population was 1,309 at the 2000 census. The 2010 census shows a population of 3,041.Grantville is located along the southern border of Coweta County at 33°14′14″N 84°49′37″W (33.237252, -84.827059). U.S. Route 29 runs through the city, passing south of the center, while Interstate 85 passes through the eastern part of the city, crossing US 29 at Exit 35. I-85 leads northeast 46 miles (74 km) to Atlantaand southwest 114 miles (183 km) to Montgomery, Alabama, while US 29, a more local road, leads north 12 miles (19 km) to Newnan, the Coweta County seat, and southwest 20 miles (32 km) to LaGrange. According to the United States Census Bureau, Grantville has a total area of 5.6 square miles (14.5 km2), of which 0.02 square miles (0.05 km2), or 0.31%, is water.