| Carterville CUSD 5, IL (District) |
| Carthage Central School District, NY (District) |
| Carthage ESD 317, IL (District) |
| Carthage ISD, TX (District) |
| Carthage R-Ix, MO (District) |
| Carthage School District, SD (District) |
| Cartwright Elementary District, AZ (District) |
| Caruthers Unified, CA (District) |
| Caruthersville 18, MO (District) |
| Carver, MA (District) |
| Carver County, MN (ISD) |
| Carver-Scott Educational Coop., MN (District) |
| Cary CCSD 26, IL (District) |
| Casa Esperanza Montessori, NC (District) |
| Casa Grande Elementary District, AZ (District) |
