| 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 |
| Marianapolis Preparatory School |
26 Chase Road , P.O. Box 304
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Thompson | CT |
| Marvelwood School |
476 Skiff Mountain Road, P.O. Box 3001
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Kent | CT |
| 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 |
| Mercersburg Academy |
300 E. Seminary Street
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Mercersburg | PA |
| 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 |
| 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 |
| Monte Vista Christian School |
2 School Way
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Watsonville | CA |
| Montverde Academy |
17235 7th Street
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Montverde | FL |