| Ojibwe Charter School, MI (PSA) |
| Okaloosa, FL (District) |
| Okaloosa County, FL (ISD) |
| Okanogan County, WA (ISD) |
| Okanogan School District, WA (District) |
| Okarche, OK (District) |
| Okaw Area Vocational Center, IL (District) |
| Okaw Regional Voc System, IL (District) |
| Okaw Valley CUSD 302, IL (District) |
| Okay, OK (District) |
| Okeechobee, FL (District) |
| Okeechobee County, FL (ISD) |
| Okeene, OK (District) |
| Okemah, OK (District) |
| Okemos Public Schools, MI (District) |
