Willowbrook, alternatively named Willow Brook, is an unincorporated community and census-designated place in Los Angeles County, California. The population was 24,295 at the 2020 census, down from 35,983 at the 2010 census. Willowbrook is the home to the newly renovated Martin Luther King Jr. Outpatient Center. Also located in Willowbrook is the Charles R.
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