| Old Colony Regional Vocational Technical, MA (District) |
| Old Forge SD, PA (District) |
| Old Fort Local School District, OH (District) |
| Old Mission Peninsula School, MI (PSA) |
| Old National Trail Spec Serv Coop, IN (District) |
| Old Redford Academy, MI (PSA) |
| 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) |
