| Lutheran High School North | 5.7 |
Regular elementary or secondary | 9-12 | 379 | 15.5 | Lutheran Church - Missouri Synod |
| Incarnate Word Academy | 7.7 |
Regular elementary or secondary | 9-12 | 547 | 14.2 | Roman Catholic |
| Crossroads College Preparatory School | 9.9 |
Regular elementary or secondary | 7-12 | 216 | 8.5 | Nonsectarian |
| Cardinal Ritter College Prep High School | 10.0 |
Regular elementary or secondary | 9-12 | 388 | 10.3 | Roman Catholic |
| Rosati-kain High School | 10.1 |
Regular elementary or secondary | 9-12 | 396 | 13.2 | Roman Catholic |
| St Louis University High School | 11.1 |
Regular elementary or secondary | 9-12 | 1056 | 11.6 | Roman Catholic |
| Block Yeshiva High School | 11.8 |
Regular elementary or secondary | 9-12 | 65 | 6.5 | Jewish |
| John Burroughs School | 12.5 |
Regular elementary or secondary | 7-12 | 590 | 7.1 | Nonsectarian |
| St Elizabeth Academy | 12.7 |
Regular elementary or secondary | 9-12 | 209 | 8.9 | Roman Catholic |
| Westminster Christian Academy | 13.9 |
Regular elementary or secondary | 7-12 | 865 | 13.3 | Presbyterian |
| Villa Duchesne / Oak Hill School | 14.3 |
Regular elementary or secondary | 7-12 | 440 | 7.5 | Roman Catholic |
| St John The Baptist College Prep High School | 14.4 |
Regular elementary or secondary | 9-12 | 161 | 8.1 | Roman Catholic |
| Bishop Du Bourg High School | 14.6 |
Regular elementary or secondary | 9-12 | 600 | 12.0 | Roman Catholic |
| St Mary's High School | 14.7 |
Regular elementary or secondary | 9-12 | 409 | 12.7 | Roman Catholic |
| De Smet Jesuit High School | 14.7 |
Regular elementary or secondary | 9-12 | 1122 | 12.7 | Roman Catholic |
| Nerinx Hall High School | 14.9 |
Regular elementary or secondary | 9-12 | 619 | 12.9 | Roman Catholic |
| Duchesne High School | 15.0 |
Regular elementary or secondary | 9-12 | 603 | 13.7 | Roman Catholic |
| Visitation Academy Of St Louis | 15.8 |
Montessori | 7-12 | 410 | 20.4 | Roman Catholic |
| Christian Brothers College High School | 16.3 |
Regular elementary or secondary | 9-12 | 1016 | 13.8 | Roman Catholic |
| Ursuline Academy | 16.9 |
Regular elementary or secondary | 9-12 | 648 | 14.9 | Roman Catholic |
| St Louis Priory School | 17.0 |
Regular elementary or secondary | 7-12 | 396 | 8.3 | Roman Catholic |
| Lutheran High School South | 17.5 |
Regular elementary or secondary | 9-12 | 543 | 13.0 | Lutheran Church - Missouri Synod |
| Cor Jesu Academy | 17.7 |
Regular elementary or secondary | 9-12 | 579 | 10.7 | Roman Catholic |
| Notre Dame High School | 18.3 |
Regular elementary or secondary | 9-12 | 405 | 9.2 | Roman Catholic |
| St John Vianney High School | 18.4 |
Regular elementary or secondary | 9-12 | 584 | 12.3 | Roman Catholic |
| Thomas Jefferson School | 19.4 |
Regular elementary or secondary | 7-12 | 82 | 6.5 | Nonsectarian |
| Greenpark Christian Academy | 19.6 |
Regular elementary or secondary | Pre-KG-12 | 7 | 2.3 | Christian (no specific denomination) |
| Lutheran High School Of St Charles County | 19.8 |
Regular elementary or secondary | 9-12 | 363 | 15.4 | Lutheran Church - Missouri Synod |
| John F Kennedy Catholic School | 20.0 |
Regular elementary or secondary | 9-12 | 374 | 15.5 | Roman Catholic |
