| Clay County, IA (ISD) |
| Clay County, IL (ISD) |
| Clay County, TX (ISD) |
| Clay County Schools, KY (District) |
| Clay County Schools, NC (District) |
| Clay County Schools, WV (District) |
| Clay Joint Elementary, CA (District) |
| Clay Local School District, OH (District) |
| Clay/Jasper/Richland/N Wayne RDS, IL (District) |
| Claymont City School District, OH (District) |
| Claysburg Kimmel SD, PA (District) |
| Clayton, OK (District) |
| Clayton, MO (District) |
| Clayton County, GA (District) |
| Clayton County, GA (ISD) |
