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Olympia Community Unit School District 16
- Olympia North Elementary School Calendar
- Olympia South Elementary School Calendar
- Olympia West Elementary School Calendar
- Olympia Middle School Calendar
- Olympia High School Calendar
Other districts in Illinois state
- Oak Lawn Chsd 229 School District
- O Fallon Twp Hsd 203 School District
- Oak Park - River Forest School District 200
- Oak Lawn-Hometown School District 123
- Odin Public School District 722 School District
- Oakwood Community Unit School District 76
- Orangeville Community Unit School District 203
- Orion Community Unit School District 223
- Orland School District 135
- Okaw Valley Community Unit School District 302
- Oak Grove School District 68