what county is willowbrook, il, in?
Willowbrook, DuPage County, Illinois. This article is about village in DuPage County. For the unincorporated area, see Willowbrook, Will County, Illinois. For the school in Villa Park, Illinois, see Willowbrook High School. Willowbrook is a village in DuPage County, Illinois, United States. The population was 8,967 at the 2000 census.