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. History The area now known as Riverdale was settled before the Civil War. Riverdale was founded in 1886, when the railroad was extended to that point. In 1908, the city was incorporated with the name Riverdale, named in honor of Mr. W.S. Rivers, the original owner of the town site. Geography Riverdale is in western Clayton County, south of downtown Atlanta and northwest of Jonesboro, the county seat. According to the U.S. Census Bureau, Riverdale has an area of , of which , or 0.22%, is water. Demographics 2020 census As of the 2020 United States census, there were 15,129 people, 5,517 households, and 3,404 families residing in the city. 2000 census As of the census of 2000, there were 12,478 people, 4,389 households, and 3,107 families residing in the city. The population density was . There were 4,590 housing units at an average density of . The racial makeup of the city was 20.09% White, 67.42% African American, 0.30% Native American, 7.73% Asian, 0.08% Pacific Islander, 2.28% from other races, and 2.10% from two or more races. Hispanic or Latino of any race were 4.81% of the population. There were 4,389 households, out of which 44.6% had children under the age of 18 living with them, 39.3% were married couples living together, 25.2% had a female householder with no husband present, and 29.2% were non-families. 24.0% of all households were made up of individuals, and 3.3% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.32. In the city, the population was spread out, with 32.5% under the age of 18, 9.3% from 18 to 24, 36.1% from 25 to 44, 16.4% from 45 to 64, and 5.8% who were 65 years of age or older. The median age was 30 years. For every 100 females, there were 87.4 males. For every 100 females age 18 and over, there were 80.6 males. The median income for a household in the city was $39,530, and the median income for a family was $42,323. Males had a median income of $30,802 versus $26,102 for