| St. Charles County, MO (ISD) |
| St. Charles Parish, LA (District) |
| St. Charles Parish, LA (ISD) |
| St. Charles Public School District, MN (District) |
| St. Charles R-Vi, MO (District) |
| St. Clair Co. Academy of Style, MI (PSA) |
| St. Clair County, MO (ISD) |
| St. Clair County Career Prep Academy, MI (PSA) |
| St. Clair County Intervention Academy, MI (PSA) |
| St. Clair County Learning Academy, MI (PSA) |
| St. Clair County RESA, MI (ISD) |
| St. Clair Public School District, MN (District) |
| St. Clair R-Xiii, MO (District) |
| St. Clairsville-Richland City School District, OH (District) |
| St. Cloud Public School District, MN (District) |
