Willowbrook first appeared as an unincorporated place in the
1970 U.S. census as part of the Compton census county division; The median age was 30.8 years; 28.7% of residents were under the age of 18 and 8.9% were 65 years of age or older. There were 96.1 males for every 100 females, and 93.7 males for every 100 females age 18 and over. There were 5,958 housing units at an average density of , of which 97.0% were occupied. Of the occupied units, 43.3% were owner-occupied and 56.7% were renter-occupied; the homeowner vacancy rate was 0.4% and the rental vacancy rate was 2.8%. 12,387 (34.4%) African American, 273 (0.8%) Native American, 119 (0.3%) Asian, 49 (0.1%) Pacific Islander, 13,858 (38.5%) from
other races, and 1,052 (2.9%) from two or more races. There were 22,979 residents of Hispanic or Latino origin, of any race (63.9%). The census reported that 35,577 people (98.9% of the population) lived in households, 116 (0.3%) lived in non-institutionalized group quarters, and 290 (0.8%) were institutionalized. There were 8,721 households, 4,920 (56.4%) had children under the age of 18 living in them, 3,626 (41.6%) were
opposite-sex married couples living together, 2,635 (30.2%) had a female householder with no husband present, 859 (9.8%) had a male householder with no wife present. There were 640 (7.3%)
unmarried opposite-sex partnerships, and 38 (0.4%)
same-sex married couples or partnerships. 1,336 households (15.3%) were one person and 585 (6.7%) had someone living alone who was 65 or older. The average household size was 4.08. There were 7,120 families (81.6% of households); the average family size was 4.38. The age distribution was 11,790 people (32.8%) under the age of 18, 4,500 people (12.5%) aged 18 to 24, 9,595 people (26.7%) aged 25 to 44, 7,200 people (20.0%) aged 45 to 64, and 2,898 people (8.1%) who were 65 or older. The median age was 28.2 years. For every 100 females, there were 92.1 males. For every 100 females aged 18 and over, there were 89.2 males. There were 9,600 housing units at an average density of 2,546.3 per square mile, of the occupied units 4,525 (51.9%) were owner-occupied and 4,196 (48.1%) were rented. The homeowner vacancy rate was 2.5%; the rental vacancy rate was 5.9%. 19,021 people (52.9% of the population) lived in owner-occupied housing units and 16,556 people (46.0%) lived in rental housing units. According to the 2010 United States Census, Willowbrook had a median household income of $34,005, with 31.5% of the population living below the federal poverty line.
Mapping L.A. According to
Mapping L.A., Mexican (43.8%) and Unspecified African (1.6%) were the most common ancestries in 2000. Mexico (85.1%) and El Salvador (6.9%) were the most common foreign places of birth. ==Government==