Peachtree City is the largest city in Fayette County, Georgia, United States. As of the 2020 United States Census, it has a population of 38,244.

Fayette County is a county located in the north central portion of the U.S. state of Georgia. As of the 2020 census, the population was 119,194, an increase from 106,567 in 2010. Fayette County was established in 1821. The county seat, Fayetteville, was established in 1823. Much of Fayette County is bordered on the east side by the Flint River.