| Barat Academy | 3.2 |
Regular elementary or secondary | 9-9 | 81 | 9.2 | Roman Catholic |
| St Dominic High School | 7.1 |
Regular elementary or secondary | 9-12 | 731 | 12.2 | Roman Catholic |
| Lutheran High School Of St Charles County | 8.0 |
Regular elementary or secondary | 9-12 | 363 | 15.4 | Lutheran Church - Missouri Synod |
| St Louis Priory School | 11.8 |
Regular elementary or secondary | 7-12 | 396 | 8.3 | Roman Catholic |
| Duchesne High School | 11.9 |
Regular elementary or secondary | 9-12 | 603 | 13.7 | Roman Catholic |
| John F Kennedy Catholic School | 11.9 |
Regular elementary or secondary | 9-12 | 374 | 15.5 | Roman Catholic |
| Christian Brothers College High School | 13.1 |
Regular elementary or secondary | 9-12 | 1016 | 13.8 | Roman Catholic |
| De Smet Jesuit High School | 13.5 |
Regular elementary or secondary | 9-12 | 1122 | 12.7 | Roman Catholic |
| Visitation Academy Of St Louis | 14.0 |
Montessori | 7-12 | 410 | 20.4 | Roman Catholic |
| Westminster Christian Academy | 14.9 |
Regular elementary or secondary | 7-12 | 865 | 13.3 | Presbyterian |
| Villa Duchesne / Oak Hill School | 15.2 |
Regular elementary or secondary | 7-12 | 440 | 7.5 | Roman Catholic |
| Block Yeshiva High School | 15.9 |
Regular elementary or secondary | 9-12 | 65 | 6.5 | Jewish |
| John Burroughs School | 17.8 |
Regular elementary or secondary | 7-12 | 590 | 7.1 | Nonsectarian |
| St John Vianney High School | 18.1 |
Regular elementary or secondary | 9-12 | 584 | 12.3 | Roman Catholic |
| Ursuline Academy | 18.5 |
Regular elementary or secondary | 9-12 | 648 | 14.9 | Roman Catholic |
| Thomas Jefferson School | 19.4 |
Regular elementary or secondary | 7-12 | 82 | 6.5 | Nonsectarian |
| Incarnate Word Academy | 20.2 |
Regular elementary or secondary | 9-12 | 547 | 14.2 | Roman Catholic |
| Nerinx Hall High School | 20.2 |
Regular elementary or secondary | 9-12 | 619 | 12.9 | Roman Catholic |
| St Francis Borgia Regional High School | 21.1 |
Regular elementary or secondary | 9-12 | 538 | 14.9 | Roman Catholic |
| Cor Jesu Academy | 21.4 |
Regular elementary or secondary | 9-12 | 579 | 10.7 | Roman Catholic |
| Lutheran High School North | 21.9 |
Regular elementary or secondary | 9-12 | 379 | 15.5 | Lutheran Church - Missouri Synod |
| Lutheran High School South | 22.0 |
Regular elementary or secondary | 9-12 | 543 | 13.0 | Lutheran Church - Missouri Synod |
| Crossroads College Preparatory School | 22.0 |
Regular elementary or secondary | 7-12 | 216 | 8.5 | Nonsectarian |
| Bishop Du Bourg High School | 22.8 |
Regular elementary or secondary | 9-12 | 600 | 12.0 | Roman Catholic |
| St Louis University High School | 23.3 |
Regular elementary or secondary | 9-12 | 1056 | 11.6 | Roman Catholic |
| Greenpark Christian Academy | 23.5 |
Regular elementary or secondary | Pre-KG-12 | 7 | 2.3 | Christian (no specific denomination) |
| Rosati-kain High School | 23.8 |
Regular elementary or secondary | 9-12 | 396 | 13.2 | Roman Catholic |
| St John The Baptist College Prep High School | 24.4 |
Regular elementary or secondary | 9-12 | 161 | 8.1 | Roman Catholic |
| Cardinal Ritter College Prep High School | 24.8 |
Regular elementary or secondary | 9-12 | 388 | 10.3 | Roman Catholic |
