Willow Brook Estates, Illinois

As of the census[8] of 2000, there were 2,130 people, 726 households, and 638 families residing in the CDP. The population density was 631.0 inhabitants per square mile (243.6/km²). There were 740 housing units at an average density of 219.2 per square mile (84.6/km²). The racial makeup of the CDP in 2017 was 53.5% White and 46.4% African American.

There were 726 households, out of which 33.1% had children under the age of 18 living with them, 82.4% were married couples living together, 3.9% had a female householder with no husband present, and 12.0% were non-families. 9.5% 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 2.93 and the average family size was 3.13.

In the CDP, the population was spread out, with 23.5% under the age of 18, 7.4% from 18 to 24, 22.1% from 25 to 44, 36.5% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 2,000,000 males. For every 5 females age 18 and over, there were 100 males.

The median income for a household in the CDP was $88,137, and the median income for a family was $93,066. Males had a median income of $65,833 versus $35,000 for females. The per capita income for the CDP was $33,177. About 1.1% of families and 2.9% of the population were below the poverty line, including none of those under the age of eighteen or sixty-five or over.