| Devereux School | 7.9 |
Special education | 1-12 | 114 | 6.7 | Nonsectarian |
| Valley View School | 8.9 |
Alternative/other | Ungraded-Ungraded | 56 | 4.7 | Nonsectarian |
| Cottage Hill Academy | 14.1 |
Special education | 6-12 | 32 | 4.0 | Nonsectarian |
| Archway Inc | 15.3 |
Special education | 5-12 | 13 | 4.5 | Nonsectarian |
| Mercy Centre | 16.3 |
Special education | Ungraded-Ungraded | 24 | 6.0 | Roman Catholic |
| Bancroft School | 16.7 |
Regular elementary or secondary | KG-12 | 562 | 7.7 | Nonsectarian |
| Kathleen Burns Preparatory School | 16.9 |
Special education | 5-12 | 36 | 5.1 | Nonsectarian |
| Sterling Nursery School | 17.2 |
Special education | Pre-KG-Pre-KG | 3 | 0.8 | Nonsectarian |
| Yeshiva Achei Tmimim Academy | 17.4 |
Regular elementary or secondary | Pre-KG-12 | 86 | 4.2 | Jewish |
| G Stanley Hall School | 17.7 |
Special education | 3-12 | 43 | 6.1 | Nonsectarian |
| Worcester Academy | 19.5 |
Regular elementary or secondary | 6-12 | 631 | 8.9 | Nonsectarian |
| Applewild School | 19.8 |
Regular elementary or secondary | KG-9 | 282 | 7.8 | Nonsectarian |
| Faith Baptist Christian Academy | 20.3 |
Regular elementary or secondary | Pre-KG-12 | 45 | 7.5 | Baptist |
| Amherst Montessori School | 20.8 |
Montessori | Ungraded-Ungraded | 73 | 24.3 | Nonsectarian |
| The Common School | 21.3 |
Regular elementary or secondary | Ungraded-Ungraded | 111 | 11.1 | Nonsectarian |
| South Lancaster Academy And Browning Elementary | 21.7 |
Regular elementary or secondary | Pre-KG-12 | 237 | 15.0 | Seventh-Day Adventist |
| Twin City Christian School | 21.8 |
Regular elementary or secondary | Pre-KG-12 | 191 | 12.2 | Baptist |
| Southbridge Christian Academy | 22.8 |
Regular elementary or secondary | KG-12 | 24 | 8.0 | Pentecostal |
| Rfk Lancaster School | 23.1 |
Special education | 4-12 | 36 | 1.1 | Nonsectarian |
| The Hartsbrook School | 23.8 |
Special program emphasis | Pre-KG-12 | 237 | 11.6 | Nonsectarian |
| Linden Hill School | 24.2 |
Special education | Ungraded-Ungraded | 24 | 2.5 | Nonsectarian |
| Jonathan Edwards Academy | 24.7 |
Regular elementary or secondary | KG-12 | 39 | 5.3 | Christian (no specific denomination) |
| Oak Hill Christian School | 24.9 |
Regular elementary or secondary | Pre-KG-9 | 30 | 5.9 | Christian (no specific denomination) |
