Coweta County is a county located in the west central portion of the U.S. state of Georgia. As of the 2010 census, the population was 127,317. The county seat is Newnan. According to the U.S. Census Bureau, the county has a total area of 446 square miles, of which 441 square miles is land and 4.9 square miles is water.The eastern half of Coweta County, from Palmetto southwest to Newnan, then south to Luthersville, is in the Upper Flint River sub-basin of the ACF River Basin (Apalachicola-Chattahoochee-Flint River Basin). The western half is in the Middle Chattahoochee River-Lake Harding sub-basin of the same ACF River Basin. As of the 2010 United States Census, there were 127,317 people, 45,673 households, and 34,737 families residing in the county.