| Covington-Douglas, OK (District) |
| Cowan Community School Corp, IN (District) |
| Cowden-Herrick CUSD 3A, IL (District) |
| Coweta, OK (District) |
| Coweta County, GA (District) |
| Coweta County, GA (ISD) |
| Cowgill R-Vi, MO (District) |
| Cowley County, KS (ISD) |
| Cowley County Special Services Cooperative, KS (District) |
| Cowlitz County, WA (ISD) |
| Coxsackie-athens Central School District, NY (District) |
| Coyle, OK (District) |
| Cozad Community Schools, NE (District) |
| Cplc Community Schools Dba Hiaki High School, AZ (District) |
| Cplc Community Schools Dba Toltecalli High School, AZ (District) |
