| Orange-Ulster Boces, NY (ISD) |
| Orangeburg 03, SC (District) |
| Orangeburg 04, SC (District) |
| Orangeburg 05, SC (District) |
| Orangeburg 80, SC (District) |
| Orangeburg County, SC (ISD) |
| Orangefield ISD, TX (District) |
| Orangeville CUSD 203, IL (District) |
| Orcas Island School District, WA (District) |
| Orchard Academy, MI (PSA) |
| Orchard Elementary, CA (District) |
| Orchard Farm R-V, MO (District) |
| Orchard Park Academy, OH (PSA) |
| Orchard Park Central School District, NY (District) |
| Orchard Prairie School District, WA (District) |
