| Mason County, KY (Phantom) |
| Mason County Central Schools, MI (District) |
| Mason County Eastern Schools, MI (District) |
| Mason County Schools, KY (District) |
| Mason County Schools, WV (District) |
| Mason ISD, TX (District) |
| Mason Public Schools (Ingham), MI (District) |
| Mason Run High School, OH (PSA) |
| Mason Sau Office, NH (District) |
| Mason School District, NH (District) |
| Massac County, IL (ISD) |
| Massac UD 1, IL (District) |
| Massachusetts Department of Education, MA (State) |
| Massapequa Union Free School District, NY (District) |
| Massena Central School District, NY (District) |
