| Oregon-Howell R-Iii, MO (District) |
| Orenda Charter School, TX (PSA) |
| Orick Elementary, CA (District) |
| Orient School Department, ME (District) |
| Orient School District, WA (District) |
| 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) |
