| Sumter 01, SC (District) |
| Sumter County, GA (ISD) |
| Sumter County, GA (District) |
| Sumter County, AL (ISD) |
| Sumter County, AL (District) |
| Sumter County, SC (ISD) |
| Sumter County, FL (ISD) |
| Sun Area Technical Institute, PA (District) |
| Sun Prairie Area School District, WI (District) |
| Sun River Valley Elem, MT (District) |
| Sunapee Sau Office, NH (District) |
| Sunapee School District, NH (District) |
| SunBridge Schools, OH (PSA) |
| Sunburst K-12 Schools, MT (District) |
| Sundale Union Elementary, CA (District) |
