| Red Lion Christian Academy | Bear | K-12 | 695 | 9.5 | Christian (nondenominational) |
| Calvary Christian Academy | Dover | PreK-12 | 330 | 8.2 | Assembly of God |
| St. Andrew's School | Middletown | 9-12 | 320 | 5.9 | Episcopal |
| Greenwood Mennonite School | Greenwood | PreK-12 | 296 | 12.6 | Mennonite |
| St. Annes Episcopal School | Middletown | PreK-8 | 256 | 7.3 | Episcopal |
| Delmarva Christian High School | Georgetown | 9-12 | 198 | 11.7 | Christian (nondenominational) |
| Fairwinds Christian School | Bear | PreK-12 | 173 | 12 | Baptist |
| Epworth Christian School | Laurel | PreK-8 | 162 | 11.6 | Christian (nondenominational) |
| Concord Christian Academy | Wilmington | PreK-12 | 136 | 8.6 | Baptist |
| The Cross Christian Academy | Seaford | PreK-12 | 120 | 10 | Christian (nondenominational) |
| Milford Christian School | Milford | PreK-11 | 118 | 9.8 | Baptist |
| Central de Christian Academy | Dover | PreK-9 | 116 | 13 | Christian (nondenominational) |
| Harvest Christian Academy New Castle | New Castle | PreK-12 | 100 | 8.6 | Christian (nondenominational) |
| Harvest Christian Academy | New Castle | PreK-12 | 94 | 8.2 | Christian (nondenominational) |
| Urban Promise School | Wilmington | PreK-12 | 85 | 5.5 | Christian (nondenominational) |
| Green Hill | Dover | 1-8 | 46 | 15.3 | Amish |
| Dover First Christian School | Dover | PreK-8 | 45 | 11.5 | Seventh-Day Adventist |
| Serviam Girls Academy | Wilmington | 5-8 | 44 | 5.6 | Christian (nondenominational), all-girls |
| Towle Institute | Hockessin | 6-12 | 40 | 4 | Christian (nondenominational) |
| Shady Lane School | Hartly | 1-8 | 36 | 18 | Amish |
| West Center School | Hartly | 1-8 | 33 | 16.5 | Amish |
| Sharon Temple Adventist School | Wilmington | K-8 | 33 | 13.8 | Seventh-Day Adventist |
| Kenton Mennonite School | Clayton | 1-10 | 31 | 8.6 | Mennonite |
| Honeysuckle Knoll School | Dover | 1-8 | 31 | 15.5 | Amish |
| Southern Meadow School | Wyoming | K-8 | 26 | 23.6 | Amish |
| Coopers Corner School | Camden Wyoming | 1-8 | 26 | 13 | Amish |
| Capitol Baptist School | Dover | K-12 | 24 | 5 | Baptist |
| Parkers Chapel Amish School | Marydel | 1-8 | 24 | 12 | Amish |
| Wileys School | Dover | 1-8 | 24 | 8 | Amish |
| Apple Grove School | Dover | 1-8 | 23 | 23 | Amish |
| St. Johns Preschool Kindergarten | Seaford | PreK-K | 17 | 13.1 | Methodist |
| Destiny Calling Academy | Wilmington | K-9 | 10 | not reported | Christian (nondenominational) |
| Maranatha Christian Academy | Wilmington | PreK-10 | 10 | 3.4 | Brethren |
| Developing Minds Preschool and Learning Center | Wilmington | PreK-K | 7 | 7 | Episcopal |
| Brandywine Valley Christian Preschool | Wilmington | PreK-K | 4 | 2 | Baptist |