| Greater Portland Christian School | 4.9 |
Regular elementary or secondary | KG-12 | 141 | 8.9 | Christian (no specific denomination) |
| The School At Sweetser | 5.9 |
Special education | KG-12 | 99 | 6.6 | Nonsectarian |
| Aucocisco School | 6.3 |
Special education | 3-12 | 33 | 1.9 | Nonsectarian |
| Waynflete School | 6.3 |
Regular elementary or secondary | Pre-KG-12 | 540 | 8.7 | Nonsectarian |
| Sonlight Christian School | 6.4 |
Special education | 3-12 | 7 | 7.0 | Roman Catholic |
| Thornton Academy | 6.6 |
Regular elementary or secondary | 6-12 | 1401 | 15.2 | Nonsectarian |
| Morrison Developmental Center | 9.3 |
Special education | KG-12 | 6 | 1.2 | Nonsectarian |
| Nfi Buxton - Beacon House | 12.7 |
Special education | Ungraded-Ungraded | 6 | 3.8 | Nonsectarian |
| Living Waters Christian School | 13.1 |
Regular elementary or secondary | Pre-KG-12 | 45 | 4.5 | Pentecostal |
| Standish Baptist Academy | 14.6 |
Regular elementary or secondary | KG-12 | 55 | 7.9 | Baptist |
| North Yarmouth Academy | 17.4 |
Regular elementary or secondary | 6-12 | 330 | 13.5 | Nonsectarian |
| Windham Christian Academy | 20.1 |
Regular elementary or secondary | Pre-KG-12 | 88 | 7.9 | Assembly of God |
| Berean Christian Academy | 20.5 |
Regular elementary or secondary | 2-12 | 10 | 10.0 | Calvinist |
| Royal Academy | 20.7 |
Alternative/other | 1-12 | 139 | 27.8 | Nonsectarian |
| Merriconeag Waldorf School | 21.7 |
Special program emphasis | Pre-KG-10 | 222 | 6.0 | Nonsectarian |
| Mse/mhc-collaborative School | 22.8 |
Special education | 1-12 | 46 | 6.6 | Nonsectarian |
| Pine Tree Academy | 23.0 |
Regular elementary or secondary | KG-12 | 119 | 9.5 | Seventh-Day Adventist |
| Maine Classical School | 23.4 |
Special program emphasis | 5-10 | 26 | 4.0 | Christian (no specific denomination) |
