| Ohio County Schools, KY (District) |
| Ohio Department of Education, OH (State) |
| Ohio Digital Learning School, OH (PSA) |
| Ohio Hi-Point Joint Vocational School District, OH (District) |
| Ohio Hi-Point JVSD CTPD, OH (District) |
| Ohio Valley Educational Service Center, OH (ISD) |
| Ohio Valley Local CTPD, OH (District) |
| Ohio Virtual Academy, OH (PSA) |
| Oil City Area SD, PA (District) |
| Oilton, OK (District) |
| Ojai Unified, CA (District) |
| Ojibwe Charter School, MI (PSA) |
| Okaloosa, FL (District) |
| Okaloosa County, FL (ISD) |
| Okanogan County, WA (ISD) |
