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Oak Grove School District 68
- Oak Grove West School Calendar
- Oak Grove East Elementary School Calendar
- Oak Grove Elementary 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
- Olympia Community Unit School District 16
- Orion Community Unit School District 223
- Orland School District 135
- Okaw Valley Community Unit School District 302