| Cirrus Charter Academy, GA (PSA) |
| Cis Academy, NC (District) |
| Cisco ISD, TX (District) |
| Cissna Park CUSD 6, IL (District) |
| Citizens Academy, OH (PSA) |
| Citizens Academy Southeast, OH (PSA) |
| Citizens Leadership Academy, OH (PSA) |
| Citizens Leadership Academy East, OH (PSA) |
| Citizens Of The World Charter School 1, NY (PSA) |
| Citizens Of The World Charter School 2, NY (PSA) |
| Citizens of the World Charter Schools - Cincinnati, OH (PSA) |
| Citizenship-Science Academy, NY (PSA) |
| Citrus, FL (District) |
| Citrus County, FL (ISD) |
| City Academy, MN (District) |
