| Sappo School | 8.2 |
Special education | 5-12 | 35 | 5.8 | Nonsectarian |
| Our Savior New American School | 9.1 |
Regular elementary or secondary | Pre-KG-12 | 235 | 5.2 | Lutheran Church - Missouri Synod |
| International Christian School | 9.7 |
Regular elementary or secondary | Pre-KG-12 | 67 | 7.4 | Baptist |
| Long Island Baptist Academy | 11.0 |
Regular elementary or secondary | KG-12 | 34 | 7.1 | Baptist |
| Cleary School For The Deaf | 12.6 |
Special education | Pre-KG-12 | 45 | 2.9 | Nonsectarian |
| Leonard E Burket Christian School | 14.5 |
Regular elementary or secondary | Pre-KG-12 | 135 | 10.0 | Assembly of God |
| Smithtown Christian School | 14.7 |
Regular elementary or secondary | Pre-KG-12 | 525 | 13.0 | Assembly of God |
| Gersh Academy | 15.1 |
Special education | 3-12 | 56 | 3.6 | Nonsectarian |
| Nysarc Inc-suffolk Chapter | 15.3 |
Special education | Pre-KG-Pre-KG | 95 | 9.5 | Nonsectarian |
| Developmental Disabilities Institute | 15.8 |
Special education | Ungraded-Ungraded | 228 | 6.3 | Nonsectarian |
| The Children's Center At Ucp | 17.6 |
Special education | Ungraded-Ungraded | 54 | 4.9 | Nonsectarian |
| Academy Of St Joseph | 19.5 |
Regular elementary or secondary | KG-12 | 366 | 8.0 | Roman Catholic |
| Nassau Suffolk Services For Autism | 19.5 |
Special education | Ungraded-Ungraded | 25 | 6.2 | Nonsectarian |
| Ascent | 22.5 |
Special education | KG-11 | 23 | 2.1 | Nonsectarian |
| Upper Room Christian School | 22.9 |
Regular elementary or secondary | KG-12 | 310 | 9.0 | Christian (no specific denomination) |
