| School Name | Street_Address | City | State |
| MacDuffie School |
Ames Hill Drive
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Springfield | MA |
| Maine Central Institute |
295 Main Street
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Pittsfield | ME |
| Maine School of Science & Mathematics |
95 High Street
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Limestone | ME |
| Malvern Preparatory School |
418 S. Warren Ave
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Malvern | PA |
| Maret School |
3000 Cathedral Avenue, NW
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Washington | DC |
| Marianapolis Preparatory School |
26 Chase Road , P.O. Box 304
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Thompson | CT |
| Marin Academy |
1600 Mission Avenue
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San Rafael | CA |
| Marin Country Day School |
5221 Paradise Drive
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Corte Madera | CA |
| Marin Horizon School |
305 Montford Avenue
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Mill Valley | CA |
| Marin Primary & Middle School |
20 Magnolia Ave
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Larkspur | CA |
| Marist School |
3790 Ashford-Dunwoody Rd., NE
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Atlanta | GA |
| Marmion Academy |
1000 Butterfield Road
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Aurora | IL |
| Marvelwood School |
476 Skiff Mountain Road, P.O. Box 3001
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Kent | CT |
| Mary Institute and St. Louis Country Day School |
101 North Warson Road
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St. Louis | MO |
| Maryknoll School |
1526 Alexander Street
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Honolulu | HI |
| Maumee Valley Country Day School |
1715 South Reynolds Road
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Toledo | OH |
| McCallie School |
500 Dodds Avenue - Missionary Ridge
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Chattanooga | TN |
| McDonogh School |
8600 McDonogh Road, PO Box 380
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Owing Mills | MD |
| McLean School of Maryland |
8224 Lochinver Lane
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Potomac | MD |
| Meadowbrook School |
1641 Hampton Road
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Meadowbrook | PA |
| Meadowbrook School of Weston, Inc. |
10 Farm Road
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Weston | MA |
| Menlo School |
50 Valparaiso Ave
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Atherton | CA |
| Mercersburg Academy |
300 E. Seminary Street
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Mercersburg | PA |
| Metairie Park Country Day School |
300 Park Road
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Metairie | LA |
| Miami Country Day School |
601 NE 107th Street
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Miami | FL |
| Mid-Pacific Institute |
2445 Ka'ala Street
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Honolulu | HI |
| Middleburg Academy |
35321 Notre Dame Lane
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Middleburg | VA |
| Middlesex School Top 25 |
1400 Lowell Road
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Concord | MA |
| Midland School |
5100 Figueroa Mountain Rd.
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Los Olivos | CA |
| Millbrook School |
131 Millbrook School Road
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Millbrook | NY |
| Miller School of Albemarle |
1000 Samuel Miller Loop
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Charlottesville | VA |
| Milton Academy Top 25 |
170 Centre Street
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Milton | MA |
| Milton Hershey School |
P.O. Box 830, 430 E. Governor Road
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Hershey | PA |
| Miss Hall's School |
492 Holmes Road
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Pittsfield | MA |
| Miss Porter's School |
60 Main Street
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Farmington | CT |
| Mizzentop Day School |
64 E. Main Street
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Pawling | NY |
| Monarch School |
P.O. Box 410, 26 Aspen Lane
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Heron | MT |
| Montclair Kimberley Academy |
201 Valley Road
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Montclair | NJ |
| Monte Vista Christian School |
2 School Way
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Watsonville | CA |
| Montessori School of Raleigh |
7005 Leadmine Road
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Raleigh | NC |
| Montgomery Bell Academy |
4001 Harding Road
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Nashville | TN |
| Montrose School |
29 North Street
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Medfield | MA |
| Montverde Academy |
17235 7th Street
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Montverde | FL |
| Mooreland Hill School |
166 Lincoln Road
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Kensington | CT |
| Moravian Academy |
4313 Green Pond Road
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Bethlehem | PA |
| Morristown-Beard School |
70 Whippany Road
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Morristown | NJ |
| Moses Brown School |
250 Lloyd Avenue
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Providence | RI |
| Mount Madonna School |
491 Summit Road
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Mount Madonna | CA |
| Mount Pisgah Christian School |
9820 Nesbit Ferry Road
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Johns Creek | GA |
| Mount Tamalpais School |
100 Harvard Avenue
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Mill Valley | CA |
| Mount Vernon Presbyterian School |
471 Mount Vernon Highway N.E.
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Atlanta | GA |
| Mt. Bethel Christian Academy |
4385 Lower Roswell Road
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Marietta | GA |