School Directory
| School/Organization | City | State | Country |
|---|---|---|---|
| Madison High School | Adrian | Michigan | United States |
| Magnolia High School | Magnolia | Texas | United States |
| Maine West High School | Des Plaines | Illinois | United States |
| Malvern Preparatory School | Malvern | Pennsylvania | United States |
| Manchester Memorial High School | Manchester | New Hampshire | United States |
| Manchester West High School | Manchester | New Hampshire | United States |
| Mankato East High School, Mankato, MN | Mankato | Minnesota | United States |
| Mankato West High School | Mankato | Minnesota | United States |
| Mansfield High School | Mansfield | Texas | United States |
| Maple Mountain High School | Spanish Fork | Utah | United States |
| Maranatha Christian Schools | San Diego | California | United States |
| Marcellus High School | Marcellus | New York | United States |
| Marietta High School | Marietta | Georgia | United States |
| Marin Academy | San Rafael | California | United States |
| Marion Harding High School | Marion | Ohio | United States |
| Marlborough School | Los Angeles | California | United States |
| Marshall County High School | Lewisburg | Tennessee | United States |
| Mary Persons High School | Forsyth | Georgia | United States |
| Marysville High School | Marysville | California | United States |
| Maryvale High School | Phoenix | Arizona | United States |
| Maryvale Preparatory School | Lutherville | Maryland | United States |
| Mattituck High School | Mattituck | New York | United States |
| McCallie School | Chattanooga | Tennessee | United States |
| McClain High School | Greenfield | Ohio | United States |
| McCluer High School | Florissant | Missouri | United States |
| Mccluer North High School | Florissant | Missouri | United States |
| Medford High School | Medford | Massachusetts | United States |
| Memorial Health | Marysville | Ohio | United States |
| Memphis University School | Memphis | Tennessee | United States |
| Mercersburg Academy | Mercersburg | Pennsylvania | United States |
| Mercy High School | Baltimore | Maryland | United States |
| Mercy Hospital/Westminster Christian Academy | Town and Country | Missouri | United States |
| Mercy Sports Medicine - Durango High School | Durango | Colorado | United States |
| Merrillville High School | Merrillville | Indiana | United States |
| Mesa Ridge High School | Colo Spgs | Colorado | United States |
| Mesquite High School | Gilbert | Arizona | United States |
| Mesquite Poteet High school | Mesquite | Texas | United States |
| Metro Tech High School | Phoenix | Arizona | United States |
| Midd-West High School | Middleburg | Pennsylvania | United States |
| Middlesex School | Concord | Massachusetts | United States |
| Middleton HS | Tampa | Florida | United States |
| Middletown HS North | Middletown | New Jersey | United States |
| Milan High School | Milan | Michigan | United States |
| Milford High School | Highland | Michigan | United States |
| Millbury Jr Sr High School | Millbury | Massachusetts | United States |
| Mission College Preparatory Catholic High School | San Luis Obispo | California | United States |
| Mission Oak High School | Tulare | California | United States |
| Mitchell High School | Mitchell | Indiana | United States |
| Model Secondary School for the Deaf | Washington | District of Columbia | United States |
| Moe Moe High School | Tucson | Arizona | United States |
| Moline High School | Moline | Illinois | United States |
| Monadnock Regional High School | Swanzey | New Hampshire | United States |
| Mondovi High School | Mondovi | Wisconsin | United States |
| Monroe Central Jr.-Sr. High School | Parker City | Indiana | United States |
| Monta Vista High School | Cupertino | California | United States |
| Moshannon Valley School District | Houtzdale | Pennsylvania | United States |
| Mount Rainier High School | Des Moines | Washington | United States |
| Mount Saint Joseph High School | Baltimore | Maryland | United States |
| Mount Vernon Presbyterian School | Atlanta | Georgia | United States |
| Mountain Ridge High School | Glendale | Arizona | United States |
| Mt. Abraham Union Middle & High School | Bristol | Vermont | United States |
| Mt. Spokane High School | Mead | Washington | United States |
| Muhlenberg School District | Reading | Pennsylvania | United States |
| Munster High School | Munster | Indiana | United States |
| Murray State University | Murray | Kentucky | United States |
| Muskego High School | Muskego | Wisconsin | United States |
| Mustang Public Schools | Mustang | Oklahoma | United States |
| Naperville North High School | Naperville | Illinois | United States |
| Nashua High School South | Nashua | New Hampshire | United States |
| Navajo Preparatory School | Farmington | New Mexico | United States |
| Nederland ISD | Nederland | Texas | United States |
| Needham B. Broughton High School | Raleigh | North Carolina | United States |
| Neshannock Township School District | New Castle | Pennsylvania | United States |
| New Prairie United School Corporation | New Carlisle | Indiana | United States |
| New Trier HS | Winnetka | Illinois | United States |
| Newberry High School | Newberry | South Carolina | United States |
| Newman Central Catholic | Sterling | Illinois | United States |
| Newport High School | Newport | Oregon | United States |
| Newtown High School | Sandy Hook | Connecticut | United States |
| Niagara High School | Niagara | Wisconsin | United States |
| Niskayuna Central School District | Niskayuna | New York | United States |
| Niwot High School | Niwot | Colorado | United States |
| Noble High School | North Berwick | Maine | United States |
| Noblesville High School | Noblesville | Indiana | United States |
| Nogales Unified School District | Nogales | Arizona | United States |
| Norco High School | Norco | California | United States |
| Norman High School | Norman | Oklahoma | United States |
| Norman North High School | Norman | Oklahoma | United States |
| North Brunswick Township High School | North Brunswcik | New Jersey | United States |
| North Carolina Wesleyan College | Rocky Mount | North Carolina | United States |
| North Central High School | Spokane | Washington | United States |
| North College Hill High School | Cincinnati | Ohio | United States |
| North Daviess High School | Elnora | Indiana | United States |
| North Dickinson County School | Felch | Michigan | United States |
| North Laurel High School | London | Kentucky | United States |
| North Montgomery High School | Crawfordsville | Indiana | United States |
| North Polk High School | Alleman | Iowa | United States |
| North Technical High School | Florissant | Missouri | United States |
| Northeast High School | Goose Lake | Iowa | United States |
| Northern Highlands Regional High School | Allendale | New Jersey | United States |