| Cass County, MN (ISD) |
| Cass County, IN (ISD) |
| Cass County, IL (ISD) |
| Cass County, MO (ISD) |
| Cass Lake-Bena Public Schools, MN (District) |
| Cass SD 63, IL (District) |
| Cass Township Schools, IN (District) |
| Cassadaga Valley Central School District, NY (District) |
| Cassia County, ID (ISD) |
| Cassia County Joint District, ID (District) |
| Cassopolis Public Schools, MI (District) |
| Cassville R-Iv, MO (District) |
| Cassville School District, WI (District) |
| Castaic Union, CA (District) |
| Castine School Department, ME (District) |
