| Callisburg ISD, TX (District) |
| Calloway County, KY (Phantom) |
| Calloway County Schools, KY (District) |
| Calumet, WI (ISD) |
| Calumet, OK (District) |
| Calumet City SD 155, IL (District) |
| Calumet Co Cdeb, WI (District) |
| Calumet Public Schools, MI (District) |
| Calumet Public SD 132, IL (District) |
| Calvert County, MD (ISD) |
| Calvert County Public Schools, MD (District) |
| Calvert ISD, TX (District) |
| Calvin, OK (District) |
| Calvin Nelms Charter Schools, TX (PSA) |
| CAM Comm School District, IA (District) |
