The average household size was 3.97 and the average family size was 4.35. The age distribution was 37.3% under the age of 18, 10.9% from 18 to 24, 28.4% from 25 to 44, 14.7% from 45 to 64, and 8.7% 65 or older. The median age was 26 years. For every 100 females, there were 93.3 males. For every 100 females age 18 and over, there were 87.6 males. The median household income was $27,811 and the median family income was $30,107. Males had a median income of $22,250 versus $23,615 for females. The per capita income for the CDP was $9,865. About 26.8% of families and 30.7% of the population were below the poverty line, including 39.5% of those under age 18 and 16.8% of those age 65 or over. In the California State Legislature, Willowbrook is in , and in . In the United States House of Representatives, Willowbrook is in . The Los Angeles County Sheriff's Department (LASD) operates the Century Station in Lynwood, serving Willowbrook. The United States Postal Service Willowbrook Post Office is located at 2241 East El Segundo Boulevard in the CDP. Martin Luther King, Jr. Community Hospital, replacing the King Drew Hospital − Martin Luther King, Jr. Multi-Service Ambulatory Care Center in 2015, is located in Willowbrook. The Charles R. Drew University of Medicine and Science and King Drew Magnet High School of Medicine and Science are adjacent. The Willowbrook/Rosa Parks station is a major hub Los Angeles County Metro Rail station on the Blue Line and Green Line. The station is located in the Century Freeway (Interstate 105) median, above the intersection of Imperial Highway and Wilmington Avenue in the Willowbrook. It is a major transfer point for commuters. As a major transfer station, Willowbrook/Rosa Parks Station also acts as a major bus hub, serving many bus routes operated by LA Metro and other regional/municipal transit agencies. The station also has park and ride facilities, including 975 parking spaces and 4 bike lockers. To the east of the station is the Metro Rail Operations Center, which is the dispatch hub for all Metro Rail trains. The Los Angeles County Metropolitan Transportation Authority (LA Metro) provides Metro Local bus services to and from the Willowbrook area. The Los Angeles County Department of Public Works also operates two shuttle services that serve the Willowbrook area:  Charles R. Drew University of Medicine and Science is located in Willowbrook.