Oak Park first appeared as a
census designated place in the
1990 U.S. census. The census reported that 99.9% of residents lived in households, 0.1% lived in non-institutionalized group quarters, and no one was institutionalized. 100.0% of residents lived in urban areas, while 0.0% lived in rural areas. There were 5,324 housing units at an average density of , of which 5,200 (97.7%) were occupied and 124 (2.3%) were vacant. Of occupied units, 70.4% were owner-occupied and 29.6% were occupied by renters. The homeowner vacancy rate was 0.6%, and the rental vacancy rate was 3.3%.
Income and poverty The median household income in 2023 was $160,484, and the
per capita income was $80,193. About 1.4% of families and 3.3% of the population were below the poverty line.
2010 census At the
2010 census Oak Park had a population of 14,266. The population density was . The racial makeup of Oak Park was 11,473 (83.1%) White, 141 (1.0%) African American, 32 (0.2%) Native American, 1,556 (11.3%) Asian, 9 (0.1%) Pacific Islander, 162 (1.2%) from
other races, and 438 (3.2%) from two or more races. Hispanic or Latino of any race were 826 people (6.0%). The census reported that 14,625 people (100% of the population) lived in households, and none (0%) were institutionalized. There were 5,158 households, 2,112 (40.9%) had children under the age of 18 living in them, 3,054 (59.2%) were
opposite-sex married couples living together, 590 (11.4%) had a female householder with no husband present, 184 (3.6%) had a male householder with no wife present. There were 204 (4.0%)
unmarried opposite-sex partnerships, and 34 (0.7%)
same-sex married couples or partnerships. 1,046 households (20.3%) were one person and 258 (5.0%) had someone living alone who was 65 or older. The average household size was 2.68. There were 3,828 families (74.2% of households); the average family size was 3.14. The age distribution was 3,622 people (26.2%) under the age of 18, 1,004 people (7.3%) aged 18 to 24, 3,031 people (21.9%) aged 25 to 44, 4,981 people (36.1%) aged 45 to 64, and 1,173 people (8.5%) who were 65 or older. The median age was 41.7 years. For every 100 females, there were 92.6 males. For every 100 females age 18 and over, there were 88.5 males. There were 5,297 housing units at an average density of 1,001.2 per square mile, of the occupied units 3,842 (74.5%) were owner-occupied and 1,316 (25.5%) were rented. The homeowner vacancy rate was 1.2%; the rental vacancy rate was 3.5%. 10,706 people (77.5% of the population) lived in owner-occupied housing units and 3,104 people (22.5%) lived in rental housing units. ==Education==