| Clarendon County, SC (ISD) |
| Clarendon ISD, TX (District) |
| Clarendon School District, AR (District) |
| Clarinda Comm School District, IA (District) |
| Clarion Area SD, PA (District) |
| Clarion County, PA (ISD) |
| Clarion County Career Center, PA (District) |
| Clarion Limestone Area SD, PA (District) |
| Clarion-Goldfield-Dows Comm School District, IA (District) |
| Clark, WI (ISD) |
| Clark Co. R-I, MO (District) |
| Clark County, MO (ISD) |
| Clark County, IN (ISD) |
| Clark County, AR (ISD) |
| Clark County, KY (Phantom) |
