| School | State | Tuition | Students | International Students | SAT | Type and Grade |
|---|---|---|---|---|---|---|
| Monadnock Waldorf School | $20,500 | 197 | 5% | -- | K-12 | |
| Meadow Glade School | $4,360 | 253 | -- | -- | Grades Kindergarten-8 | |
| Mullen High School | $13,500 | 749 | -- | -- | Grades 9-12 | |
| Iowa Mennonite School | $7,900 | 99 | -- | -- | Grades 9-12 | |
| Stillwater Montessori School | -- | 62 | -- | -- | Grades Prekindergarten-8 | |
| The Meadows School | $25,705 | 900 | 10% | -- | K-12 | |
| Moses Brown School | $50,000 | 416 | 3.7% | 1320 | K-12 | |
| Mercy High School | $17,850 | 400 | 2.3% | 1150 | 9-12 | |
| Medfield High School | -- | 775 | 0.3% | 1221 | 09-12 | |
| Medford High School | -- | 1261 | 8.3% | 1091 | ||
| Medway High School | -- | 631 | 0.2% | 1143 | 09-12 | |
| Melrose High School | -- | 929 | 1.6% | 1136 | 09-12 | |
| Methuen High School | -- | 1906 | -- | 1037 | 09-12 | |
| Middleborough High School | -- | 833 | -- | 1125 | 09-12 | |
| Milford High School | -- | 1257 | -- | 1102 | 09-12 | |
| Millis High School | -- | 332 | 0.6% | 1088 | 09-12 | |
| Milton High School | -- | 1127 | 1.3% | 1146 | ||
| St. Thomas More School | $59,900 | 180 | 28% | 1160 | 8-12, PG | |
| New Directions School At Nccf | -- | 30 | -- | -- | Grades 4-12 | |
| Alsion Montessori Middle/High | -- | 61 | -- | -- | Grades 7 - 12 |