Newnan is a city in and the county seat of Coweta County, Georgia, United States, about 40 miles southwest of Atlanta. Its population was 42,54…Newnan is a city in and the county seat of Coweta County, Georgia, United States, about 40 miles southwest of Atlanta. Its population was 42,549 at the 2020 census, up from 33,039 in 2010. Newnan was established as county seat of Coweta County in 1828, and was named for North Carolinian General Daniel Newnan. It quickly became a prosperous magnet for lawyers, doctors, other professionals, and merchants. Much of Newnan's prosperity was due to its thriving cotton industry, which relied on slavery.
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