| Marbury High School | - | Varsity | Large | 0 | | |
| Marcus High School | - | Varsity | - | 0 | | |
| Marcus High School | - | Varsity | Large | 0 | | |
| Marcus High School | - | Junior Varsity | - | 0 | | |
| Maria Carrillo High School | - | Varsity | Small | 0 | | |
| Maria Carrillo High School | - | - | Medium | 0 | | |
| Maria Carrillo High School | - | Varsity | Medium | 0 | | |
| Maria Regina High School | - | Varsity | Large | 0 | | |
| Maria Regina High School | - | Varsity | Small | 0 | | |
| Maria Regina High School | - | Varsity | Medium | 0 | | |
| Maria Regina High School | - | Varsity | Small | 0 | | |
| Maria Regina High School | - | Varsity | - | 0 | | |
| Marian High School | - | Varsity | Small | 0 | | |
| Marian High School | - | Varsity | - | 0 | | |
| Marietta High School | - | Varsity | - | 0 | | |
| Marietta High School | - | Varsity | - | 0 | | |
| Marietta High School | - | Varsity | Small | 0 | | |
| Marietta High School | - | Varsity | - | 0 | | |
| Marietta High School | - | Varsity | Small | 0 | | |
| Marin Catholic High School | - | Varsity | Medium | 0 | | |
| Marin Catholic High School | - | Varsity | Medium | 0 | | |
| Marina High School | - | Junior | - | 0 | | |
| Marina High School | - | - | - | 0 | | |
| Marina High School | - | Varsity | - | 0 | | |
| Marina High School | - | Varsity | Medium | 0 | | |
| Marina High School | - | Varsity | Small | 0 | | |
| Marion County High School | - | Varsity | Small | 0 | | |
| Marion County High School | - | Varsity | Small | 0 | | |
| Marion County High School | - | Varsity | - | 0 | | |
| Marion County High School | - | Varsity | Small | 0 | | |
| Marion Harding High School | - | Varsity | - | 0 | | |
| Marion High School | - | Varsity | Medium | 0 | | |
| Marlboro High School | - | Varsity | Small | 0 | | |
| Marlboro High School | - | Varsity | Small | 0 | | |
| Marlboro High School | - | Varsity | Medium | 0 | | |
| Marlboro High School | - | Varsity | Medium | 0 | | |
| Marlboro High School | - | Varsity | Small | 0 | | |
| Marple-Newtown High School | - | Varsity | Large | 0 | | |
| Marple-Newtown High School | - | Varsity | Small | 0 | | |
| Marple-Newtown High School | - | Varsity | Small | 0 | | |
| Marple-Newtown High School | - | Varsity | Large | 0 | | |
| Marquette High School | - | Varsity | Small | 0 | | |
| Marquette High School | - | Junior | Small | 0 | | |
| Marquette High School | - | Varsity | Small | 0 | | |
| Mars Area High School | - | Varsity | Medium | 0 | | |
| Mars Area High School | - | Varsity | Small | 0 | | |
| Mars Hill Bible High School | - | Varsity | - | 0 | | |
| Marshall County High School | - | Varsity | Medium | 0 | | |
| Marshall Fund High School | - | Varsity | - | 0 | | |
| Martha Layne Collins High School | - | Varsity | Small | 0 | | |
| Martin Luther King High School | - | Varsity | 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 | - | Junior | - | 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 | - | - | - | 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 | | |