| Orleans Parish, LA (ISD) |
| Orleans Parish, LA (District) |
| Orleans-Niagara Boces, NY (ISD) |
| Oro Grande, CA (District) |
| Orofino Joint District, ID (District) |
| Orondo School District, WA (District) |
| Orono Public School District, MN (District) |
| Oroville City Elementary, CA (District) |
| Oroville School District, WA (District) |
| Oroville Union High, CA (District) |
| Orrick R-Xi, MO (District) |
| Orrington School Department, ME (District) |
| Orrville City School District, OH (District) |
| Orting School District, WA (District) |
| Ortonville Public Schools, MN (District) |
