| Cornwall Central School District, NY (District) |
| Cornwall Lebanon, PA (District) |
| Cornwall School District, CT (District) |
| Corona Municipal Schools, NM (District) |
| Corona-Norco Unified, CA (District) |
| Coronado Unified, CA (District) |
| Corpus Christi ISD, TX (District) |
| Corpus Christi Montessori School, TX (PSA) |
| Corrales International School, NM (PSA) |
| Corrections - Doe, DE (District) |
| Corrigan-Camden ISD, TX (District) |
| Corry Area SD, PA (District) |
| Corsica School District, SD (District) |
| Corsicana ISD, TX (District) |
| Cortez Park Charter Middle School Inc., AZ (PSA) |
