| Cor Jesu Academy
| St. Louis | MO | 9th-12th | none | Girls only | 580 | Roman Catholic |
| Crossroads College Preparatory School
| St. Louis | MO | 7th-12th | none | Coed | 210 | None |
| De Smet Jesuit High School
| St. Louis | MO | 9th-12th | none | Boys only | 1114 | Roman Catholic (Jesuit) |
| Incarnate Word Academy
| St. Louis | MO | 9th-12th | none | Girls only | 584 | Roman Catholic |
| John Burroughs School
5/5
based on 3 student review(s) | St. Louis | MO | 7th-12th | none | Coed | 590 | None |
| John F. Kennedy Catholic High School
| Manchester | MO | 9th-12th | none | Coed | 400 | Roman Catholic |
| Mary Institute and Saint Louis Country Day School
4.7/5
based on 4 student review(s) | St. Louis | MO | PK-12th | none | Coed | 1220 | None |
| Nerinx Hall High School
| Webster Groves | MO | 9th-12th | none | Coed | 619 | Roman Catholic |
| Notre Dame High School
| St. Louis | MO | 9th-12th | none | Girls only | 406 | Roman Catholic |
| Rosati-Kain High School
| St. Louis | MO | 9th-12th | none | Girls only | 410 | Roman Catholic |
| Saint Louis Priory School
| St. Louis | MO | 7th-12th | none | Boys only | 390 | Roman Catholic |
| St. John Vianney High School
| St. Louis | MO | 9th-12th | none | Boys only | 585 | Roman Catholic |
| St. Joseph's Academy
| St. Louis | MO | 9th-12th | none | Girls only | 642 | Roman Catholic |
| Visitation Academy
| St. Louis | MO | PK-12th | none | Girls only | 621 | Roman Catholic |
| Westminster Christian Academy
| St. Louis | MO | 7th-12th | none | Coed | 864 | None |
| Whitfield School
| St. Louis | MO | 6th-12th | none | Coed | 474 | None |