School List [M-O]
- Maconaquah High School
- Madison-Grant High School
- Madison Consolidated High School
- Manchester Jr-Sr High School
- Marian High School
- Marion Academy
- Marion High School
- Marquette Catholic High School
- Martinsville High School
- Mater Dei High School
- McCutcheon High School
- McLean Education Center (Alt)
- Medora Jr & Sr High School
- Merrillville High School
- Michigan City High School
- Midwest Elite Prep Acad Inc
- Milan High School
- Mishawaka High School
- Mississinewa High School
- Mitchell High School
- Monroe Central Jr-Sr High School
- Monrovia High School
- Mooresville High School
- Morgan Township Middle/High School
- Morristown Jr-Sr High School
- Morton Senior High School
- Mount Vernon High School
- MTI School of Knowledge
- Mt Vernon High School
- Muncie Central High School
- Munster High School
- Neighbors' New Vistas High School
- New Albany Senior High School
- New Castle High School
- New Haven High School
- New Palestine High School
- New Prairie High School
- New Tech Institute
- New Vision Christian Academy
- New Washington Middle/High School
- Nexus Academy of Indianapolis
- N Judson-San Pierre Jr Sr High Sch
- Noblesville High School
- North Central High School
- North Central High School
- North Daviess Jr-Sr High School
- North Decatur Jr-Sr High School
- Northeast Dubois High School
- Northeastern High School
- Northfield Jr-Sr High School
- North Harrison High School
- North High School
- North Knox Jr-Sr High School
- North Miami Middle/High School
- North Montgomery High School
- North Newton Jr-Sr High School
- North Posey High School
- North Putnam Sr High School
- Northridge High School
- Northrop High School
- North Side High School
- North Vermillion High School
- Northview High School
- Northwest Community High School
- Northwestern Senior High School
- North White High School
- North Wood High School
- Norwell High School
- Oak Hill High School
- Oakland High School
- Oaklawn Campus Program
- Oldenburg Academy
- Options Charter School - Carmel
- Options Charter School - Noblesville
- Oregon-Davis Jr-Sr High School
- Orleans Jr-Sr High School
- Our Lady Of Providence High School
- Owen Valley Community High School