11
Oak Park – River Forest School District 200
Other districts in Illinois state
- Oak Lawn Chsd 229 School District
- O Fallon Twp Hsd 203 School District
- 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
- Oak Grove School District 68