| Cimarron, OK (District) |
| Cimarron County, OK (ISD) |
| Cimarron Municipal Schools, NM (District) |
| Cimarron-Ensign, KS (District) |
| Cincinnati Achievement Academy, OH (PSA) |
| Cincinnati City CTPD, OH (District) |
| Cincinnati City School District, OH (District) |
| Cincinnati Classical Academy, OH (PSA) |
| Cincinnati College Preparatory Academy, OH (PSA) |
| Cincinnati Technology Academy, OH (PSA) |
| Cincinnatus Central School District, NY (District) |
| Cinnabar Elementary, CA (District) |
| CINNAMINSON TOWNSHIP PUBLIC SCHOOLS, NJ (District) |
| Circle, KS (District) |
| Circle City Prep Charter School, IN (District) |
