Riverdale is a city in Clayton County, Georgia, United States. The population was 15,134 at the 2010 census, up from 12,478 in 2000. Riverdale is a suburb just south of Hartsfield–Jackson Atlanta International Airport and is part of the Atlanta metropolitan area.

Clayton County is located in the north central portion of the U.S. state of Georgia. As of 2021, the population was estimated to be 297,100 by the Census Bureau. The county seat is Jonesboro.