| Okeechobee, FL (District) |
| Okeechobee County, FL (ISD) |
| Okeene, OK (District) |
| Okemah, OK (District) |
| Okemos Public Schools, MI (District) |
| Okfuskee County, OK (ISD) |
| Oklahoma City, OK (District) |
| Oklahoma County, OK (ISD) |
| Oklahoma Department of Education, OK (State) |
| Oklahoma School For The Blind, OK (District) |
| Oklahoma School For The Deaf, OK (District) |
| Oklahoma Union, OK (District) |
| Oklee Public School District, MN (District) |
| Okmulgee, OK (District) |
| Okmulgee County, OK (ISD) |
