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Ontario-Montclair School District
- Corona Elementary School Calendar
- Monte Vista Elementary School Calendar
- Mission Elementary School Calendar
- Montera Elementary School Calendar
- Vineyard Elementary School Calendar
- Howard Elementary School Calendar
- Lincoln Elementary School Calendar
- Ray Wiltsey Middle School Calendar
- Oaks Middle School Calendar
- Euclid Elementary School Calendar
- Richard Haynes Elementary School Calendar
- Del Norte Elementary School Calendar
- Vina Danks Middle School Calendar
- Elderberry Elementary School Calendar
- Lehigh Elementary School Calendar
- Central Language Academy Calendar
- Berlyn Elementary School Calendar
- Hawthorne Elementary School Calendar
- Kingsley Elementary School Calendar
- Serrano Middle School Calendar
- Edison Elementary School Calendar
- Buena Vista Arts-Integrated School Calendar
- Moreno Elementary School Calendar
- Vista Grande Elementary School Calendar
- De Anza Middle School Calendar
Other districts in California state
- Orinda Union Elementary School District
- Orcutt Union Elementary School District
- Oroville Union High School District
- Oroville City Elementary School District
- Orange Unified School District
- Oxnard School District
- Oxnard Union High School District
- Oakley Union Elementary School District
- Ocean View School District
- Ojai Unified School District
- Old Adobe Union School District
- Orange Center School District
- Oceanside Unified School District
- Orchard Elementary School District
- Orick Elementary School District
- Oak Park Unified School District
- Oak Grove Elementary School District
- Oak Valley Union Elementary School District