Illinois Schools
- Louise White School
- Lowpoint Washburn High School
- Lowrie Elementary School
- Loyola Academy
- Loyola University Chicago
- Loyola University Chicago Quinlan School Of Business
- Luther High School North
- Luther High School South
- Lutheran School Of Theology At Chicago
- Lycée Français De Chicago
- Lyons School District 103
- Lyons Township High School
- Macarthur High School
- Maccormac College
- Macomb High School
- Mahomet Seymour Community Unit School District 3
- Mahomet Seymour High School
- Maine East High School
- Maine South High School
- Maine Township High School District 207
- Maine West High School
- Malcolm X College
- Malden Grade School
- Manley Career Academy High School
- Mannheim School District 83
- Mansueto College Prep
- Manteno Community Unit School District 5
- Manual High School
- Marengo Community High School
- Marengo Union Elementary School District 165
- Marian Catholic High School
- Marian Central Catholic High School
- Marion High School
- Marist High School
- Marmion Academy
- Maroa Forsyth High School
- Marquardt School District 15
- Marquette Academy
- Marquette Catholic High School
- Marshall High School
- Mary G Peterson Elementary School
- Maryville Academy
- Mascoutah Community High School
- Mascoutah Community Unit School District
- Massac County High School
- Mater Dei Catholic High School
- Matteson School District 162
- Mattoon Community Unit School District 2
- Mattoon High School
- Maywood Melrose Park Broadview School District 89
- Mcauley School District No 27
- Mccormick Theological Seminary
- Mccrone Research Institute
- Mchenry Community High School District 156
- Mchenry County College
- Mchenry East High School
- Mchenry High School Upper Campus
- Mchenry School District 15
- Mckendree University
- Mclean County Unit District No 5
- Meadville Lombard Theological School
- Medill School Of Journalism
- Medinah School District 11
- Mendon Community Unit School District 4
- Mendota Consolidated Community School District 289
- Mendota Township High School
- Mennonite College Of Nursing
- Mercer County High School
- Meridian High School
- Meridian High School
- Metamora Township High School
- Metea Valley High School
- Methodist College
- Michele Clark Magnet High School
- Midland High School
- Midstate College
- Midwest Technical Institute
- Midwestern University
- Milledgeville High School
- Millikin University
- Minooka Community High School
- Moline High School
- Moline Coal Valley School District 40
- Monmouth College
- Monmouth Roseville High School
- Monticello High School
- Monticello Seminary
- Montini Catholic High School
- Moody Bible Institute
- Moraine Valley Community College
- Morgan Park Academy
- Morgan Park High School
- Morris Community High School
- Morrison High School
- Morrison Tech
- Morthland College
- Morton College
- Morton Community Unit School District 709
- Morton High School
- Moses Montefiore Academy