Willowbrook is a city located in Illinois. With a 2020 population of 8,491, it is the 244th largest city in Illinois and the 3465th largest city in the United States . Willowbrook is currently declining at a rate of -0.52% annually and its population has decreased by -0.57% since the most recent census, which recorded a population of 8,540 in 2010. Willowbrook reached it's highest population of 8,967 in 2000. Spanning over 3 miles, Willowbrook has a population density of 3,157 people per square mile.
The average household income in Willowbrook is $116,925 with a poverty rate of 5.11%. The median rental costs in recent years comes to $1,585 per month, and the median house value is $254,700. The median age in Willowbrook is 48.9 years, 46.9 years for males, and 49.4 years for females.