| Martin Luther King High School | - | Junior | Medium | 0 | | |
| Marvin Ridge High School | - | Varsity | Large | 0 | | |
| Marvin Ridge High School | - | Varsity | - | 0 | | |
| Marvin Ridge High School | - | Varsity | - | 0 | | |
| Marvin Ridge High School | - | Varsity | Medium | 0 | | |
| Marvin Ridge High School | - | Varsity | Small | 0 | | |
| Mary G Montgomery High School | - | Varsity | - | 0 | | |
| Mary G Montgomery High School | - | Varsity | Large | 0 | | |
| Mary G Montgomery High School | - | Varsity | - | 0 | | |
| Mary G Montgomery High School | - | Varsity | Small | 0 | | |
| Mary G Montgomery High School | - | Varsity | Small | 0 | | |
| Mary G Montgomery High School | - | Varsity | - | 0 | | |
| Mary Louis Academy | - | Varsity | Medium | 0 | | |
| Mary Louis Academy | - | Varsity | Medium | 0 | | |
| Marysville High School | - | Varsity | Medium | 0 | | |
| Marysville High School | - | Varsity | Medium | 0 | | |
| Marysville High School | - | Varsity | Large | 0 | | |
| Marysville High School | - | Varsity | Small | 0 | | |
| Marysville High School-Monarch Athletic | - | Varsity | Medium | 0 | | |
| Maryville Junior High School | - | Varsity | - | 0 | | |
| Mason High School | - | Varsity | - | 0 | | |
| Mason High School | - | Varsity | - | 0 | | |
| Mason High School | - | Varsity | - | 0 | | |
| Massapequa High School | - | Varsity | Medium | 0 | | |
| Massapequa High School | - | Varsity | Small | 0 | | |
| Massapequa High School | - | Varsity | Small | 0 | | |
| Massapequa High School | - | Varsity | - | 0 | | |
| MaST Community Charter School III | - | Varsity | Large | 0 | | |
| MaST Community Charter School III | - | Varsity | - | 0 | | |
| Masters Academy | - | Varsity | - | 0 | | |
| Matanzas High School | - | Varsity | - | 0 | | |
| Mater Academy | - | Varsity | - | 0 | | |
| Mater Academy Cutler Bay | - | Varsity | Small | 0 | | |
| Mater Academy Cutler Bay | - | Varsity | Small | 0 | | |
| Mater Dei Catholic High School | - | Varsity | Medium | 0 | | |
| Mater Dei Catholic High School | - | Varsity | - | 0 | | |
| Mater Dei High School | - | - | - | 0 | | |
| Mater Dei High School | - | Varsity | Small | 0 | | |
| Mater Dei High School | - | Junior | - | 0 | | |
| Mater Dei High School | - | Varsity | - | 0 | | |
| Mayde Creek High School | - | Varsity | Large | 0 | | |
| Mayde Creek High School | - | Varsity | - | 0 | | |
| Mayde Creek High School | - | Varsity | Medium | 0 | | |
| Mayde Creek High School | - | Varsity | Large | 0 | | |
| Mayfair High School | - | Varsity | - | 0 | | |
| Mayfair High School | - | Varsity | Small | 0 | | |
| Mayfair High School | - | Varsity | Small | 0 | | |
| McAllen High School | - | Varsity | Large | 0 | | |
| McAllen High School | - | Varsity | Large | 0 | | |
| McAllen Memorial High School | - | Varsity | Medium | 0 | | |