Forest Park is a city in Clayton County, Georgia, United States. It is located approximately nine miles south of Atlanta and is part of the Atlanta–Sandy Springs–Marietta metropolitan statistical area. As of the 2020 census, the city had a population of 19,932. In the 1800s, Forest Park was named Stump Town, due to the large number of stumps left behind from trees being cut for fuel for the trains passing to and from Atlanta.