Index of Member Schools
— MacArthur, see Decatur (MacArthur)Machesney Park (Harlem)
Mackinaw (Deer Creek-M.)
Macomb
Macon (Meridian)
Madison
Mahomet (M.-Seymour)
— Maine East, see Park Ridge (Maine East)
— Maine South, see Park Ridge (Maine South)
— Maine West, see Des Plaines (Maine West)
Manito (Midwest Central)
— Manley, see Chicago (Manley)
Manlius (Bureau Valley)
Manteno
— Manual, see Peoria (Manual)
Maple Park (Kaneland)
Marengo
— Maria, see Chicago (Maria)
— Marian, see Chicago Heights (Marian)
— Marian, see Woodstock (Marian)
— Marine Military Academy, see Chicago (Marine Military Academy)
Marion (Crab Orchard)
Marion (H.S.)
Marissa
— Marist, see Chicago (Marist)
— Marmion Academy, see Aurora (Marmion Academy)
Maroa (M.-Forsyth)
— Marquette, see Alton (Marquette)
— Marquette, see Ottawa (Marquette)
— Marshall, see Chicago (Marshall)
Marshall
Martinsville
Mascoutah
Mason City (Illini Central)
— Massac County, see Metropolis (Massac County)
— Mater Dei, see Breese (Mater Dei)
— Mather, see Chicago (Mather)
Mattoon
Maywood (Proviso East)
McHenry
McLeansboro (Hamilton County)
— McNamara, see Kankakee (McNamara)
Melrose Park (Walther Lutheran)
Mendon (Unity)
Mendota
— Mercer County, see Aledo (Mercer County)
Meredosia (M.-Chambersburg)
— Meridian, see Macon (Meridian)
— Meridian, see Mounds (Meridian)
Metamora
— Metea Valley, see Aurora (Metea Valley)
— Metro-East Lutheran, see Edwardsville (Metro-East Lutheran)
Metropolis (Massac County)
— Mid-America Preparatory, see Herrick (Mid-America Preparatory)
— Midland, see Varna (Midland)
Midlothian (Bremen)
— Midwest Central, see Manito (Midwest Central)
Milford
Milledgeville
Minonk (Fieldcrest)
Minooka
Moline (H.S.)
Momence
Monmouth (M.-Roseville)
Monticello
— Montini, see Lombard (Montini)
Mooseheart
— Morgan Park, see Chicago (Morgan Park)
— Morgan Park Academy, see Chicago (Morgan Park Academy)
Morris
Morrison
Morrisonville
— Morton, see Berwyn-Cicero (Morton)
Morton
— Mother McAuley, see Chicago (Mother McAuley)
Mounds (Meridian)
— Mt. Assisi Academy, see Lemont (Mt. Assisi Academy)
— Mt. Carmel, see Chicago (Mt. Carmel)
Mt. Carmel
Mt. Olive
Mt. Prospect (Prospect)
Mt. Pulaski
Mt. Sterling (Brown County)
Mt. Vernon (H.S.)
Mt. Zion
Moweaqua (Central A & M)
Mulberry Grove
Mundelein (Carmel)
Mundelein (H.S.)
Murphysboro