| 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, IL (ISD) |
| Clark County, AR (ISD) |
| Clark County, KY (Phantom) |
| Clark County, IN (ISD) |
| Clark County, NV (ISD) |
| Clark County, ID (ISD) |
| Clark County, WA (ISD) |
| Clark County, KS (ISD) |
| Clark County District, ID (District) |
