| 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) |
| Casa Grande Union High School District, AZ (District) |
| Casa Richard Academy, MI (PSA) |
| Cascade, MT (District) |
| Cascade Career Prep High School, OH (PSA) |
