Clarendon Hills is a village in DuPage County, Illinois, United States. The population was 8,702 at the 2020 census. It is a south-west suburb of Chicago. History The area that is now Clarendon Hills was a wide, rolling prairie bordering the east side of Westmont. Most of the older villages in Downers Grove Township were built on the same street grid as the Village of Downers Grove. Instead, Clarendon Hills was built to resemble nearby Riverside, a planned, park-like suburb designed by Fredrick Law Olmsted in the late 1800's. Its long winding streets go with the natural contour of the land, rather than extending straight through from the neighboring towns. In 1923, at the time of incorporation, Clarendon Hills had a population of under 900 people. The area was incorporated to avoid annexation by the nearby affluent community of Hinsdale. The Clarendon Hills Historical Society is tasked with retaining the town's history and establishing a community center and a museum to display prominent artifacts pertaining to the history of the village. In 1961, TWA Flight 529 crashed in Clarendon Hills, killing all 73 passengers on board. On May 11, 2022, a Metra train collided with a box truck on the Prospect Avenue grade crossing; one person lost her life. Geography Clarendon Hills is located at (41.796030, -87.955960). It is approximately 18 miles southwest of Chicago. According to the 2021 census gazetteer files, Clarendon Hills has a total area of , of which (or 99.45%) is land and (or 0.55%) is water. Demographics As of the 2020 census there were 8,702 people, 3,431 households, and 2,317 families residing in the village. The population density was . There were 3,396 housing units at an average density of . The racial makeup of the village was 80.66% White, 1.47% African American, 0.11% Native American, 8.47% Asian, 1.79% from other races, and 7.49% from two or more races. Hispanic or Latino of any race were 5.96% of the population. There were 3,431 households, out of which 81.43% had children under the age of 18 living with them, 61.18% were married couples living together, 4.52% had a female householder with no husband present, and 32.47% were non-families. 31.42% of all households were made up of individuals, and 19.76% had someone living alone who was 65 years of age or older. The average household size was 3.30 and the average family size was 2.57. The village's