Oakbrook Terrace is a city in DuPage County, Illinois, and is a suburb of Chicago. As of the 2010 census, the city had a total population of 2,134, which was estimated to have decreased to 2,119 by July 2018. It is the smallest town in DuPage County, in terms of area and population.
Oakbrook Terrace was originally named Utopia, a name suggested by a postmaster. The name Oakbrook Terrace was adopted in November 1959.
According to the 2010 census, Oakbrook Terrace has a total area of 1.278 square miles (3.31 km2), of which 1.25 square miles (3.24 km2) (or 97.81%) is land and 0.028 square miles (0.07 km2) (or 2.19%) is water.
At the 2000 census there were 2,300 people in 1,198 households, including 553 families, in the city. The population density was 1,651.2 people per square mile (638.9/km²). There were 1,327 housing units at an average density of 952.7 per square mile (368.6/km²). The racial makeup of the city was 80.52% White, 4.13% African American, 12.22% Asian, 0.04% Pacific Islander, 0.87% from other races, and 2.22% from two or more races. Hispanic or Latino of any race were 4.13%.
Of the 1,198 households 14.2% had children under the age of 18 living with them, 37.9% were married couples living together, 6.6% had a female householder with no husband present, and 53.8% were non-families. 46.7% of households were one person and 13.5% were one person aged 65 or older.