ONN M-P
- Madeira
- Madison
- Madison Comprehensive
- Madison Senior
- Madison Plains
- Malvern
- Manchester
- Manchester (Akron)
- Mansfield Senior
- Maple Heights
- Mapleton
- Margaretta
- Mariemont
- Marietta
- Marion-Franklin
- Marion Catholic
- Marion Harding
- Marion Local
- Marlington
- Martins Ferry
- Marysville
- Maysville
- Mason
- Mathews
- Maumee
- Mayfield
- Mc Auley
- Mc Clain
- Mc Comb
- Mc Donald
- Meadowbrook
- Meadowdale
- Mechanicsburg
- Medina
- Meigs
- Memorial
- Memorial (St. Marys)
- Mentor
- Miami East
- Miami Trace
- Miamisburg
- Middletown
- Midpark
- Midview
- Mifflin
- Milford
- Miller
- Miller City
- Millersport
- Milton-Union
- Mineral Ridge
- Minerva
- Minford
- Minster
- Mississinawa Valley
- Mogadore
- Mohawk
- Monroe
- Monroe Central
- Monroeville
- Montpelier
- Morgan
- Mount Gilead
- Mount Healthy
- Mount Notre Dame
- Mount Vernon
- Napoleon
- National Trail
- Nelsonville-York
- New Albany
- New Bremen
- New Lexington
- New London
- New Miami
- New Philadelphia
- New Richmond
- Newark
- Newark Catholic
- Newbury
- Newcomerstown
- Newton Falls
- Niles Mc Kinley
- Nordonia
- Normandy
- North (Akron)
- North Baltimore
- North College Hill
- North Olmsted
- North Ridgeville
- North Royalton
- North (Springfield)
- North Union
- Northeastern
- Northland
- Northmont
- Northmor
- Northridge (Johnstown)
- Northridge (Dayton)
- Northwest (Canal Fulton)
- Northwest (Cincinnati)
- Northwest (Mc Dermott)
- Northwestern (Springfield)
- Northwestern (West Salem)
- Northwood
- Norton
- Norwalk
- Norwayne
- Notre Dame
- Notre Dame-Cathedral Latin
- Oak Harbor
- Oak Hill
- Oak Hills
- Oakwood
- Oberlin
- Old Fort
- Olentangy
- Olentangy Liberty
- Olentangy Orange
- Olmsted Falls
- Ontario
- Orange
- Orrville
- Otsego
- Ottawa-Glandorf
- Ottawa Hills
- Ottoville
- Padua Franciscan
- Paint Valley
- Pandora-Gilboa
- Parkway
- Parma
- Patrick Henry
- Paulding
- Peebles
- Perkins
- Perry (Perry)
- Perry (Lima)
- Perry (Massillon)
- Perrysburg
- Philo
- Pickerington North
- Pickerington Central
- Piketon
- Piqua
- Pleasant
- Plymouth
- Poland Seminary
- Port Clinton
- Portsmouth West
- Portsmouth
- Preble Shawnee
- Princeton
- Purcell Marian
- Pymatuning Valley