Every California high school.

Oakland High

Oakland Military Institute College Preparatory Academy

Oakland School for the Arts

Oakland Technical High

Oakland Unity High

Oakmont High

Ocean Grove Charter

Ocean View High

Oceanside High

Odyssey STEM Academy

Olive Grove Charter - Buellton

Olive Grove Charter - Lompoc

Olive Grove Charter - Orcutt/Santa Maria

Olive Grove Charter - Santa Barbara

Oliver Wendell Holmes Junior High

Olympian High

Online Academy - Sonoma County

Ontario High

Opportunities for Learning - Baldwin Park

Opportunities for Learning - Capistrano

Opportunities for Learning - Duarte

Opportunities for Learning - William S. Hart

Opportunity Youth Academy

Options For Youth - Duarte Inc

Options for Youth San Gabriel

Options for Youth-Acton

Options for Youth-San Bernardino

Options for Youth-San Juan

Options for Youth-Victor Valley Charter

Orange County Classical Academy

Orange County Workforce Innovation High

Orange Cove High

Orange Glen High

Orange High

Orange Vista High

Orchard View

Orcutt Academy Charter

Orestimba High

Orland High

Orosi High

Oroville High

Oscar De La Hoya Animo Charter High

Otay Ranch Senior High

Owens Valley High

Oxford Academy

Oxford Day Academy

Oxnard High

PUC CALS Middle School and Early College High

PUC Comm Charter Mid and PUC Comm Charter Early College High