| Advoserv | 0.0 |
Special education | Ungraded-Ungraded | 85 | 6.1 | Nonsectarian |
| Aquinas Academy Inc | 1.3 |
Regular elementary or secondary | KG-12 | 98 | 8.4 | Roman Catholic |
| Red Lion Christian Academy | 2.6 |
Regular elementary or secondary | Pre-KG-12 | 802 | 14.5 | Other |
| Caravel Academy | 3.3 |
Regular elementary or secondary | Pre-KG-12 | 1039 | 19.6 | Nonsectarian |
| Fairwinds Christian-school | 5.9 |
Regular elementary or secondary | Pre-KG-12 | 176 | 12.1 | Baptist |
| Tall Oaks Classical School | 7.6 |
Special program emphasis | KG-12 | 140 | 8.9 | Christian (no specific denomination) |
| Newark Center For Creative Learning | 8.6 |
Alternative/other | Ungraded-Ungraded | 84 | 8.9 | Nonsectarian |
| New Castle Christian Academy | 8.9 |
Regular elementary or secondary | KG-12 | 183 | 11.2 | Baptist |
| The New School | 9.1 |
Special program emphasis | 1-12 | 30 | 4.5 | Nonsectarian |
| High Road School Of Delaware | 13.4 |
Special education | 3-12 | 22 | 5.5 | Nonsectarian |
| The Tatnall School | 14.8 |
Regular elementary or secondary | Pre-KG-12 | 652 | 7.0 | Nonsectarian |
| Sanford School | 14.9 |
Regular elementary or secondary | Pre-KG-12 | 651 | 7.7 | Nonsectarian |
| Wilmington Christian School | 14.9 |
Regular elementary or secondary | KG-12 | 501 | 10.5 | Christian (no specific denomination) |
| Tower Hill School | 15.0 |
Regular elementary or secondary | Pre-KG-12 | 696 | 8.0 | Nonsectarian |
| Back To Basics Learning Dynamics Inc | 15.4 |
Alternative/other | 6-12 | 14 | 4.5 | Nonsectarian |
| Wilmington Friends School | 15.8 |
Regular elementary or secondary | Pre-KG-12 | 773 | 9.1 | Friends |
| Centreville School | 18.8 |
Special education | Ungraded-Ungraded | 140 | 4.6 | Nonsectarian |
| Concordia Preschool | 19.1 |
Early childhood program/child care center | Ungraded-Ungraded | 100 | 29.4 | Nonsectarian |
| Concord Christian Academy | 20.7 |
Regular elementary or secondary | Pre-KG-12 | 184 | 10.3 | Baptist |
| Kenton Mennonite School | 22.7 |
Alternative/other | 1-10 | 34 | 11.3 | Mennonite |
