| Horizon Science Academy Youngstown, OH (PSA) |
| Horizon Science Academy-Cincinnati, OH (PSA) |
| Horizon Science Academy-Cleveland Middle School, OH (PSA) |
| Horizon Science Academy-Dayton, OH (PSA) |
| Horizon Science Academy-Denison Middle School, OH (PSA) |
| Horizon Science Academy-Springfield, OH (PSA) |
| Horizons Community High School, MI (PSA) |
| Hornbrook Elementary, CA (District) |
| Hornell City School District, NY (District) |
| Horry 01, SC (District) |
| Horry County, SC (ISD) |
| Horse Creek 32, ND (District) |
| Horseheads Central School District, NY (District) |
| Horseshoe Bend School District, ID (District) |
| Hortonville Area School District, WI (District) |
