| Corning School District, AR (District) |
| Corning Union Elementary, CA (District) |
| Corning Union High, CA (District) |
| Cornish School District, NH (District) |
| Cornville Regional Charter School, ME (District) |
| 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) |
