| Cook County 15, IL (ISD) |
| Cook County 5, IL (ISD) |
| Cook County 6, IL (ISD) |
| Cook County 7, IL (ISD) |
| Cook County Public Schools, MN (District) |
| Cook County SD 130, IL (District) |
| Cooke City Elem, MT (District) |
| Cooke County, TX (ISD) |
| Coolidge ISD, TX (District) |
| Coolidge Unified District, AZ (District) |
| Coon Rapids-Bayard Comm School District, IA (District) |
| Coop Assoc for Spec Educ, IL (District) |
| Cooper Co. R-Iv, MO (District) |
| Cooper County, MO (ISD) |
| Cooper ISD, TX (District) |
