| Orient-Macksburg Comm School District, IA (District) |
| Orinda Union Elementary, CA (District) |
| Orion Academy, OH (PSA) |
| Orion CUSD 223, IL (District) |
| Oriskany Central School District, NY (District) |
| Orland Joint Unified, CA (District) |
| Orland SD 135, IL (District) |
| Orleans, MA (District) |
| Orleans Community Schools, IN (District) |
| Orleans County, NY (ISD) |
| Orleans Parish, LA (ISD) |
| Orleans Parish, LA (District) |
| Orleans-Niagara Boces, NY (ISD) |
| Oro Grande, CA (District) |
| Orofino Joint District, ID (District) |
