| Council Bluffs Comm School District, IA (District) |
| Council District, ID (District) |
| Council Rock SD, PA (District) |
| Country Club Hills SD 160, IL (District) |
| Country Gardens Charter Schools, AZ (PSA) |
| Countryside Academy, MI (PSA) |
| County Line School District, AR (District) |
| County of Union Sch Dist No43, IL (District) |
| County of Winnebago SD 320, IL (District) |
| County of Woodford School, IL (District) |
| Coupeville School District, WA (District) |
| Coupland ISD, TX (District) |
| Cove Sd 15, OR (District) |
| Covenant House Academy Detroit, MI (PSA) |
| Covenant House Academy East, MI (PSA) |
