| Calistoga Joint Unified, CA (District) |
| Callahan County, TX (ISD) |
| Callao C-8, MO (District) |
| Callaway County, MO (ISD) |
| Callaway Public Schools, NE (District) |
| 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) |
