| Name |
County |
| Mascoutah High School |
St. Clair County |
| Massac County High School |
Massac County |
| Mater Dei Catholic High School |
Clinton County |
| Mather High School |
Cook County |
| Mattoon High School |
Coles County |
| McHenry East High School |
McHenry County |
| McHenry High School - West Campus |
McHenry County |
| Mendota Township High School |
LaSalle County |
| Mercer County High School |
Mercer County |
| Meredosia Chambersburg High School |
Morgan County |
| Meridian High School |
Pulaski County |
| Meridian High School |
Macon County |
| Metamora Township High School |
Woodford County |
| Metea Valley High School |
DuPage County |
| Metro - East Lutheran High School |
Madison County |
| Michele Clark Academic Preparatory Magnet High School |
Cook County |
| Midland High School |
Marshall County |
| Midwest Central High School |
Mason County |
| Milford High School |
Iroquois County |
| Milledgeville High School |
Carroll County |
| Minooka Community High School - Central Campus |
Grundy County |
| Minooka Community High School - South Campus |
Grundy County |
| Moline High School |
Rock Island County |
| Momence High School |
Kankakee County |
| Monmouth - Roseville High School |
Warren County |
| Monticello High School |
Piatt County |
| Montini Catholic High School |
DuPage County |
| Morgan Park High School |
Cook County |
| Morris Community High School |
Grundy County |
| Morrison High School |
Whiteside County |
| Morton Alternative School |
Cook County |
| Morton East High School |
Cook County |
| Morton High School |
Tazewell County |
| Morton West High School |
Cook County |
| Mother McAuley Liberal Arts High School |
Cook County |
| Mount Carmel High School |
Cook County |
| Mount Carmel High School |
Wabash County |
| Mount Olive High School |
Macoupin County |
| Mount Pulaski High School |
Logan County |
| Mount Vernon Township High School |
Jefferson County |
| Mount Zion High School |
Macon County |
| Mulberry Grove Senior High School |
Bond County |
| Multicultural Academy of Scholarship High School |
Cook County |
| Mundelein High School |
Lake County |
| Murphysboro High School |
Jackson County |
| Nancy Jefferson Alternative School |
Cook County |
| Naperville Central High School |
DuPage County |
| Naperville North High School |
DuPage County |
| Nashville Community High School |
Washington County |
| Nazareth Academy |
Cook County |
| Neuqua Valley High School |
Will County |
| Neuqua Valley High School Birkett Freshman Center |
Will County |
| New Athens High School |
St. Clair County |
| New Trier Township High School - Northfield Campus |
Cook County |
| New Trier Township High School Winnetka Campus |
Cook County |
| Newark Community High School |
Kendall County |
| Newman Central Catholic High School |
Whiteside County |
| Newton Community High School |
Jasper County |
| Niles North High School |
Cook County |
| Niles West High School |
Cook County |
| Normal Community High School |
McLean County |
| Normal West High School |
McLean County |
| Norris City - Omaha - Enfield High School |
White County |
| North - Grand High School |
Cook County |
| North Boone High School |
Boone County |
| North Chicago Community High School |
Lake County |
| North Clay Community High School |
Clay County |
| North Lawndale College Prep School |
Cook County |
| North Mac High School |
Macoupin County |
| Northside College Preparatory High School |
Cook County |
| Northside Learning Center |
Cook County |
| Notre Dame College Prep High School |
Cook County |
| Oak Forest High School |
Cook County |
| Oak Lawn Community High School |
Cook County |
| Oak Park and River Forest High School |
Cook County |
