As the construction of subdivisions proceeded in Oak Park during the 1970s and the population increased, schooling arrangements became increasingly frustrating for residents. Students had to be bused to high schools in Simi Valley, 23 miles away by road, and back again each day, despite the fact that schools of the nearby Las Virgenes Unified School District stood in proximity. With Oak Park lying in Ventura County, California and Las Virgenes in Los Angeles County, though, Oak Park students were not allowed to attend. Seeking to deal with the problem, Oak Park residents petitioned for annexation to Las Virgenes but were rejected in 1974. In 1977, they created the Oak Park Unified School District and broke ground for the high school in 1978. Students were housed in trailers from 1979 to 1980 until the school began admitting students at its present site in 1981. It functioned as both middle and high school until 1992, when nearby Medea Creek Middle School began educating sixth through eighth-grade students. Campus expansion has continued in recent years with the addition of a library, a performing arts center, an updated gym including a new floor, a new rubberized track, a turf football field, a stadium sound system, science labs, a student services building, modernized art classrooms, and computer labs. Additional work, to comply with the Americans with Disabilities Act, improved access to the baseball and softball fields. Five drinking fountains were installed in the summer of 2013.
Academics
In 2016, Oak Park's AP program placed it at 51st in Newsweek's Top High Schools..
School facilities
Oak Park High School added a two-story bungalow-style set of classrooms in 2005. The school has a pavilion building that houses a large theater stage, several classrooms, high-ceiling band, choir rooms with acoustic paneling, and a solar array as shade structures in the school's lunch and parking areas. OPHS received the California Distinguished School Award in 2019 with special distinction for its Exemplary Career and Technical Arts pathways. School modernization was completed in 2015, and the projects completed include modernized classrooms including science labs, student services building, gym, turf field, and Arts and Technology building. Over 95% of classrooms are equipped with SmartBoards. In the school year of 2019-20 OPHS implemented a one-to one Chromebook program school wide with ubiquitous WiFi and unlimited student access to Google Apps for Education.
