| Whitinsville Christian School | 0.0 |
Regular elementary or secondary | Pre-KG-12 | 551 | 13.1 | Calvinist |
| Touchstone Community School | 5.4 |
Alternative/other | Ungraded-Ungraded | 129 | 10.4 | Nonsectarian |
| Mendon Mennonite School | 8.0 |
Regular elementary or secondary | 1-10 | 20 | 10.0 | Mennonite |
| Evergreen Center | 8.9 |
Special education | Ungraded-Ungraded | 89 | 6.8 | Nonsectarian |
| Oak Hill Christian School | 9.0 |
Regular elementary or secondary | Pre-KG-9 | 30 | 5.9 | Christian (no specific denomination) |
| Worcester Academy | 12.4 |
Regular elementary or secondary | 6-12 | 631 | 8.9 | Nonsectarian |
| G Stanley Hall School | 14.0 |
Special education | 3-12 | 43 | 6.1 | Nonsectarian |
| Yeshiva Achei Tmimim Academy | 14.4 |
Regular elementary or secondary | Pre-KG-12 | 86 | 4.2 | Jewish |
| Kathleen Burns Preparatory School | 14.7 |
Special education | 5-12 | 36 | 5.1 | Nonsectarian |
| Fay School | 15.1 |
Regular elementary or secondary | 1-9 | 379 | 6.6 | Nonsectarian |
| New England Center For Children | 15.4 |
Special education | Pre-KG-12 | 191 | 2.3 | Nonsectarian |
| Bancroft School | 16.0 |
Regular elementary or secondary | KG-12 | 562 | 7.7 | Nonsectarian |
| Archway Inc | 16.0 |
Special education | 5-12 | 13 | 4.5 | Nonsectarian |
| Mercy Centre | 16.2 |
Special education | Ungraded-Ungraded | 24 | 6.0 | Roman Catholic |
| Hillside School | 17.1 |
Regular elementary or secondary | 5-9 | 139 | 6.0 | Nonsectarian |
| Browning Elementary & South Lancaster Academy | 17.6 |
Regular elementary or secondary | Pre-KG-12 | 238 | 15.0 | Seventh-Day Adventist |
| Southbridge Christian Academy | 17.8 |
Regular elementary or secondary | KG-12 | 24 | 8.0 | Pentecostal |
| Sudbury Valley School | 17.9 |
Special program emphasis | Ungraded-Ungraded | 165 | 16.7 | Nonsectarian |
| Reed Academy | 17.9 |
Special education | Ungraded-Ungraded | 20 | 3.4 | Nonsectarian |
| The Learning Center For The Deaf | 18.0 |
Special education | Pre-KG-12 | 184 | 4.3 | Nonsectarian |
| Hill Crest Academy | 18.0 |
Alternative/other | Ungraded-Ungraded | 13 | 5.0 | Nonsectarian |
| Montrose School | 18.7 |
Regular elementary or secondary | 6-12 | 138 | 3.7 | Roman Catholic |
| Crossroad Center For Children | 21.6 |
Special education | Ungraded-Ungraded | 40 | 5.7 | Nonsectarian |
| Brandon Residential Treatment | 21.9 |
Special education | 1-11 | 74 | 5.9 | Nonsectarian |
| Amego | 22.1 |
Special program emphasis | Ungraded-Ungraded | 21 | 3.8 | Nonsectarian |
| The Rivers School | 22.6 |
Regular elementary or secondary | 6-12 | 433 | 7.5 | Nonsectarian |
| Dana Hall School | 22.8 |
Regular elementary or secondary | 6-12 | 485 | 9.2 | Nonsectarian |
| Victory Christian Academy | 23.0 |
Regular elementary or secondary | KG-12 | 14 | 4.7 | Assembly of God |
| Rfk Lancaster School | 23.2 |
Special education | 4-12 | 36 | 1.1 | Nonsectarian |
| League School Of Greater Boston | 23.3 |
Special education | KG-12 | 83 | 5.2 | Nonsectarian |
| South Lancaster Academy And Browning Elementary | 23.6 |
Regular elementary or secondary | Pre-KG-12 | 237 | 15.0 | Seventh-Day Adventist |
| Grace Baptist Christian Academy | 24.1 |
Regular elementary or secondary | Pre-KG-12 | 119 | 7.7 | Baptist |
| Willow Hill School | 24.6 |
Special education | 6-12 | 60 | 3.4 | Nonsectarian |
| Valley View School | 24.6 |
Alternative/other | Ungraded-Ungraded | 56 | 4.7 | Nonsectarian |
| Devereux School | 24.7 |
Special education | 1-12 | 114 | 6.7 | Nonsectarian |
