| Oregon County, MO (ISD) |
| Oregon CUSD 220, IL (District) |
| Oregon Department Of Education, OR (District) |
| Oregon Department of Education, OR (State) |
| Oregon School District, WI (District) |
| Oregon Trail Sd 46, OR (District) |
| Oregon-Davis School Corp, IN (District) |
| Oregon-Howell R-Iii, MO (District) |
| Orenda Charter School, TX (PSA) |
| Orick Elementary, CA (District) |
| Orient School Department, ME (District) |
| Orient School District, WA (District) |
| Orient-Macksburg Comm School District, IA (District) |
| Orinda Union Elementary, CA (District) |
| Orion Academy, OH (PSA) |
