| Clarkfield Charter School, MN (District) |
| Clarksburg, MA (District) |
| Clarksburg C-2, MO (District) |
| Clarksdale Municipal School Dist, MS (District) |
| Clarkson Public Schools, NE (District) |
| Clarkston Community School District, MI (District) |
| Clarkston School District, WA (District) |
| Clarkstown Central School District, NY (District) |
| Clarksville Com School Corp, IN (District) |
| Clarksville Comm School District, IA (District) |
| Clarksville ISD, TX (District) |
| Clarksville School District, NH (District) |
| Clarksville School District, AR (District) |
| Clarkton C-4, MO (District) |
| Classical Academy Charter School of Clifton, NJ (District) |
