| Massac UD 1, IL (District) |
| Massachusetts Department of Education, MA (State) |
| Massapequa Union Free School District, NY (District) |
| Massena Central School District, NY (District) |
| Massillon City CTPD, OH (District) |
| Massillon City School District, OH (District) |
| Massillon Digital Academy, Inc, OH (PSA) |
| Mast Community Charter School, PA (PSA) |
| MaST Community CS II, PA (PSA) |
| MaST Community CS III, PA (PSA) |
| MASTERS Program, NM (PSA) |
| Mastery Charter High School, PA (PSA) |
| Mastery CS John Wister Elementary, PA (PSA) |
| Mastery CS-Cleveland Elementary, PA (PSA) |
| Mastery Cs-Clymer Elementary, PA (PSA) |
