| Curwensville Area SD, PA (District) |
| CUSD 200, IL (District) |
| CUSD 201, IL (District) |
| CUSD 3 Fulton County, IL (District) |
| CUSD 300, IL (District) |
| CUSD 308, IL (District) |
| CUSD 4, IL (District) |
| Cushing, OK (District) |
| Cushing ISD, TX (District) |
| Cushman School District, AR () |
| Cusick School District, WA (District) |
| Custer, MT (District) |
| Custer County, ID (ISD) |
| Custer County, OK (ISD) |
| Custer County, CO (ISD) |
