OUSD on-post properties of Marine Corps Base Camp Pendleton are assigned to this high school.

Throughout much of the first half of the 1900s the campus served as the High School for the majority of the North San Diego County region - its territory spanned as far south as Encinitas and east to Vista.

OHS has experienced recent renovations due to the $125 million bond measure passed by Oceanside residents in 2000 that provided funding to the city's schools.

The remodeled campus includes new landscaping, new athletic fields, and a new three-story Science & Technology building.

Renovations to other existing buildings such as Senior Hall and the library were also included as part of the bond initiative.