| Old Rochester, MA (District) |
| Old Saybrook School District, CT (District) |
| OLD TAPPAN PUBLIC SCHOOL DISTRICT, NJ (District) |
| Oldham County, TX (ISD) |
| Oldham County, KY (Phantom) |
| Oldham County Schools, KY (District) |
| Oldham-Ramona School District, SD (District) |
| OLDMANS TOWNSHIP, NJ (District) |
| Olean City School District, NY (District) |
| Olentangy Local School District, OH (District) |
| Oley Valley SD, PA (District) |
| Olfen ISD, TX (District) |
| Olin Consolidated School District, IA (District) |
| Olive, OK (District) |
| Oliver County, ND (ISD) |
