| Groton School | 1.0 |
Regular elementary or secondary | 8-12 | 353 | 4.6 | Episcopal |
| The Victor School | 10.7 |
Special education | 8-12 | 49 | 5.6 | Nonsectarian |
| St Bernard Central High School | 11.2 |
Regular elementary or secondary | 9-12 | 485 | 17.3 | Roman Catholic |
| Trivium School | 11.4 |
Regular elementary or secondary | 7-12 | 76 | 6.7 | Roman Catholic |
| Notre Dame Preparatory School | 12.0 |
Regular elementary or secondary | 10-12 | 26 | 4.4 | Roman Catholic |
| Lowell Catholic High School | 12.1 |
Regular elementary or secondary | 9-12 | 330 | 15.5 | Roman Catholic |
| New River Academy | 12.1 |
Alternative/other | 9-11 | 8 | 2.7 | Nonsectarian |
| Middlesex School | 12.5 |
Regular elementary or secondary | 9-12 | 358 | 6.1 | Nonsectarian |
| Caritas Academy | 14.3 |
Regular elementary or secondary | 8-12 | 28 | 2.6 | Christian (no specific denomination) |
| Hudson Catholic High School | 14.6 |
Regular elementary or secondary | 9-12 | 135 | 9.2 | Roman Catholic |
| Concord Academy | 14.7 |
Regular elementary or secondary | 9-12 | 364 | 7.6 | Nonsectarian |
| Walden Street School | 15.1 |
Special education | 7-12 | 27 | 4.8 | Nonsectarian |
| Wayside Academy | 17.7 |
Special education | 8-12 | 20 | 4.0 | Nonsectarian |
| Cushing Academy | 17.8 |
Regular elementary or secondary | 9-12 | 436 | 7.2 | Nonsectarian |
| Glenhaven Academy | 18.4 |
Special education | 8-12 | 24 | 4.0 | Nonsectarian |
| St Mark's School | 20.4 |
Regular elementary or secondary | 9-12 | 359 | 5.4 | Episcopal |
| The Cambridge School Of Weston | 21.2 |
Regular elementary or secondary | 9-12 | 333 | 6.8 | Nonsectarian |
| Presentation Of Mary Academy | 21.4 |
Regular elementary or secondary | 9-12 | 215 | 8.4 | Roman Catholic |
| Central Catholic High School | 21.6 |
Regular elementary or secondary | 9-12 | 1350 | 13.9 | Roman Catholic |
| Notre Dame High School | 21.6 |
Regular elementary or secondary | 9-12 | 258 | 9.6 | Roman Catholic |
| Chapel Hill Chauncy Hall School | 22.7 |
Regular elementary or secondary | 9-12 | 174 | 5.4 | Nonsectarian |
| Gann Academy-the New Jewish High School | 22.9 |
Special program emphasis | 9-12 | 309 | 6.6 | Jewish |
| St John's High School | 23.0 |
Regular elementary or secondary | 9-12 | 965 | 14.6 | Other |
| Marian High School | 23.2 |
Regular elementary or secondary | 9-12 | 272 | 14.0 | Roman Catholic |
| Arlington School | 23.8 |
Special education | 9-12 | 38 | 4.8 | Nonsectarian |
| Cns/pathways Academy | 23.8 |
Special education | 7-12 | 30 | 4.3 | Nonsectarian |
| Belmont Hill School | 23.9 |
Regular elementary or secondary | 7-12 | 438 | 9.1 | Nonsectarian |
| St Peter-marian Catholic Jr-sr High School | 24.3 |
Regular elementary or secondary | 7-12 | 913 | 17.6 | Roman Catholic |
| The Winchendon School | 24.4 |
Regular elementary or secondary | 9-12 | 250 | 7.2 | Nonsectarian |
| Waldorf High School Of Massachusetts Bay | 24.5 |
Special program emphasis | 9-12 | 60 | 5.7 | Nonsectarian |
| Arlington Catholic High School | 24.9 |
Regular elementary or secondary | 9-12 | 765 | 15.2 | Roman Catholic |
