| Long Island Baptist Academy | 3.5 |
Regular elementary or secondary | KG-12 | 34 | 7.1 | Baptist |
| Our Savior New American School | 4.7 |
Regular elementary or secondary | Pre-KG-12 | 235 | 5.2 | Lutheran Church - Missouri Synod |
| Cleary School For The Deaf | 7.5 |
Special education | Pre-KG-12 | 45 | 2.9 | Nonsectarian |
| Life Skills School | 8.2 |
Special education | Ungraded-Ungraded | 70 | 10.0 | Nonsectarian |
| International Christian School | 8.5 |
Regular elementary or secondary | Pre-KG-12 | 67 | 7.4 | Baptist |
| Nysarc Inc-suffolk Chapter | 8.8 |
Special education | Pre-KG-Pre-KG | 95 | 9.5 | Nonsectarian |
| Gersh Academy | 10.1 |
Special education | 3-12 | 56 | 3.6 | Nonsectarian |
| Smithtown Christian School | 11.1 |
Regular elementary or secondary | Pre-KG-12 | 525 | 13.0 | Assembly of God |
| Leonard E Burket Christian School | 11.5 |
Regular elementary or secondary | Pre-KG-12 | 135 | 10.0 | Assembly of God |
| Developmental Disabilities Institute | 12.5 |
Special education | Ungraded-Ungraded | 228 | 6.3 | Nonsectarian |
| The Children's Center At Ucp | 13.3 |
Special education | Ungraded-Ungraded | 54 | 4.9 | Nonsectarian |
| Academy Of St Joseph | 14.0 |
Regular elementary or secondary | KG-12 | 366 | 8.0 | Roman Catholic |
| Nassau Suffolk Services For Autism | 15.9 |
Special education | Ungraded-Ungraded | 25 | 6.2 | Nonsectarian |
| Ascent | 17.4 |
Special education | KG-11 | 23 | 2.1 | Nonsectarian |
| Upper Room Christian School | 18.4 |
Regular elementary or secondary | KG-12 | 310 | 9.0 | Christian (no specific denomination) |
| Bethesda Sda Elementary | 23.9 |
Regular elementary or secondary | Pre-KG-10 | 123 | 15.8 | Seventh-Day Adventist |
| New Jerusalem Christian Academy | 24.8 |
Regular elementary or secondary | 2-12 | 45 | 15.0 | Pentecostal |
