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Contact Information

Ontario High School
(909) 988-7411
7:00am - 3:30pm  M-F

Administration Office

Ontario High School Administration

Mr. Eduardo Zaldivar
Cinde Diederich, Administrative Secretary


Dr. Lino Gomez-Cerrillo
Assistant Principal Instruction
Lianne Andrade, Instruction Secretary
Mrs. Annette Singleton
Assistant Principal of Achievement
Janette Martin, Achievement Secretary


Mr. Ryan Alvarez
Assistant Principal of Educational Services
Shira Morales, Educational Services Secretary


Mr. Jean-Charles Placide
Assistant Principal of Discipline
Jenny Sunderland, Discipline Secretary

Contact Us

Alvarez, Ryan (909) 988-7411 ex.2026 Assistant Principal Ed Services
Andrade, Lianne (909) 988-7411 ex.2023 Instruction Secretary
Diederich, Cinde (909) 988-7411 ex.2021 Administrative Secretary
Gomez-Cerrillo, Lino (909) 988-7411 ex.2022 Assistant Principal, Instruction
Morales, Shira (909) 988-7411 ex.2027 Ed Services Secretary
Placide, Jean-Charles (909) 988-7411 ex.2030 Assistant Principal of Discipline
Singleton, Annette (909) 988-7411 ex.2024 Assistant Principal, Achievement
Zaldivar, Eduardo (909) 988-7411 ex.2020 Principal