| Marionville R-Ix, MO (District) |
| Mariposa County Office of Education, CA (District) |
| Mariposa County Unified, CA (District) |
| Mariposa ESA, CA (ISD) |
| Marissa CUSD 40, IL (District) |
| Maritime Academy Charter School, PA (PSA) |
| Maritime Academy of Toledo The, OH (PSA) |
| Mark Armijo Academy, NM (PSA) |
| Mark Twain R-Viii, MO (District) |
| Mark Twain Union Elementary, CA (District) |
| Mark West Union Elementary, CA (District) |
| Marked Tree School District, AR (District) |
| Markesan School District, WI (District) |
| Marlboro 01, SC (District) |
| Marlboro Central School District, NY (District) |
