| Olympia CUSD 16, IL (District) |
| Olympia School District, WA (District) |
| Omaha Public Schools, NE (District) |
| Omaha School District, AR (District) |
| Omak School District, WA (District) |
| Ombudsman Educational Services Ltd A Subsidiary Of Educati, AZ (District) |
| Ombudsman Educational Services Ltd. A Subsidiary Of Educati, AZ (District) |
| Omega Alpha Academy, AZ (District) |
| Omega Schools D.B.A. Omega Academy Inc., AZ (District) |
| Omro School District, WI (District) |
| Onaga-Havensville-Wheaton, KS (District) |
| Onalaska ISD, TX (District) |
| Onalaska School District, WI (District) |
| Onalaska School District, WA (District) |
| Onamia Public School District, MN (District) |
