| Immanuel Lutheran School | PreK-8 | 100 | 10.8 | Lutheran Church (Missouri Synod) | <1 |
| Hillcrest Sda School | K-9 | 29 | 9.7 | Seventh-Day Adventist | <1 |
| Miriam High School | 9-12 | 48 | 4.4 | Nonsectarian | <1 |
| Logos School | 6-12 | 106 | 5 | Nonsectarian | 1 |
| Micds | PreK-12 | 1,220 | 8.9 | Nonsectarian | 1 |
| H.f. Epstein Hebrew Academy | PreK-12 | 109 | 3.5 | Jewish | 1 |
| The Freedom School | PreK-8 | 115 | 9.7 | Presbyterian | 2 |
| Our Lady of the Pillar School | PreK-8 | 113 | 10 | Roman Catholic | 2 |
| Torah Prep School | PreK-8 | 229 | 9.5 | Jewish | 2 |
| Torah Prep School of St. Louis | PreK-8 | 227 | 3.5 | Jewish | 2 |
| Chaminade College Preparatory School | 6-12 | 872 | 10.3 | Roman Catholic | 2 |
| Christian Academy of Greater St. Louis | PreK-12 | 103 | 7.7 | Church of Christ | 2 |
| Annunziata School | Ungraded | 18 | 6.4 | Roman Catholic | 2 |
| Community School | PreK-6 | 305 | 6.8 | Nonsectarian | 2 |
| Torah Prep School - Boys Division | PreK-8 | 229 | 12.1 | Jewish | 3 |
| Villa Duchesne School | PreK-12 | 459 | 3.8 | Roman Catholic | 3 |
| Villa Duchesne Upper and Lower School | PreK-12 | 465 | 8.9 | Roman Catholic | 3 |
| Esther Miller Bais Yaakov | 9-12 | 36 | 2.2 | Jewish | 3 |
| Agape Academy & Child Development Center | PreK-4 | 28 | 9.3 | Christian (nondenominational) | 3 |
| Immacolata School | PreK-8 | 264 | 12.6 | Roman Catholic | 3 |
| Christ the King Catholic School | PreK-8 | 186 | 9.1 | Roman Catholic | 3 |
| Ech School at Every Childs Hope | 1-12 | 34 | 8.5 | Nonsectarian | 3 |
| Central Christian School | PreK-6 | 171 | 8.8 | Presbyterian | 3 |
| St. Joseph's Academy | 9-12 | 587 | 12 | Roman Catholic | 4 |
| Our Lady of Lourdes School | PreK-8 | 260 | 12.6 | Roman Catholic | 4 |
| Visitation Academy | PreK-12 | 555 | 8.9 | Roman Catholic | 4 |
| Dayspring Academy | PreK-12 | 70 | 11.7 | Christian (nondenominational) | 4 |
| Little Flower Catholic School | K-8 | 80 | 7.7 | Roman Catholic | 4 |
| Incarnate Word Academy | 9-12 | 235 | 9.2 | Roman Catholic | 4 |
| Harper School, Llc | PreK-1 | 3 | 3 | Nonsectarian | 4 |
| Ste Genevieve Du Bois School | PreK-8 | 172 | 12 | Roman Catholic | 4 |
| St. Louis Modern Chinese School | K-12 | 229 | 47.7 | Nonsectarian | 4 |
| St. Mary Magdalen School | PreK-8 | 150 | 11.6 | Roman Catholic | 5 |
| The St. Michael School of Clayton | PreK-8 | 71 | 3.2 | Episcopal | 5 |
| Rohan Woods School | PreK-6 | 68 | 3.4 | Nonsectarian | 5 |
| The Wilson School | PreK-6 | 147 | 6.8 | Nonsectarian | 5 |
| The Waldorf School of St. Louis | PreK-8 | 56 | 4 | Nonsectarian | 5 |
| Covenant Christian School | PreK-6 | 140 | 10.8 | Presbyterian | 5 |
| Holy Spirit Catholic School | PreK-8 | 174 | 14.5 | Roman Catholic | 5 |
| St. Ann Catholic School | PreK-8 | 184 | 13.1 | Roman Catholic | 5 |
| St. Roch School | PreK-8 | 130 | 11.2 | Roman Catholic | 5 |
| International Schoolhouse | PreK-2 | 19 | 4.3 | Nonsectarian | 5 |
| Miriam School | Ungraded | 111 | 10.1 | Nonsectarian | 5 |
| Villa Di Maria Montessori School | PreK-6 | 98 | 14 | Nonsectarian | 5 |
| St. Clement Grade School | PreK-8 | 275 | 11.5 | Roman Catholic | 5 |
| Saul Mirowitz Jewish Community School | K-8 | 149 | 5.7 | Jewish | 5 |
| Kvc Academy | K-12 | 61 | 6.8 | Nonsectarian | 5 |
| St. Louis Priory School | 7-12 | 299 | 8.4 | Roman Catholic | 5 |
| Whitfield School | 6-12 | 407 | 9.1 | Nonsectarian | 5 |
| Giant Steps of St. Louis | Transitional 1st-12 | 28 | 2.5 | Nonsectarian | 6 |
| Crossroads College Preparatory School | 7-12 | 125 | 6.3 | Nonsectarian | 6 |
| Faith Academy | PreK-K | 5 | 3.3 | Nonsectarian | 6 |
| Principia School | PreK-12 | 423 | 7.7 | Other religious | 6 |
| St. Paul's Lutheran School | K-8 | 212 | 12.2 | Lutheran Church (Missouri Synod) | 6 |
| Holy Redeemer School | PreK-8 | 223 | 13.6 | Roman Catholic | 6 |
| The College School | PreK-8 | 179 | 6.7 | Nonsectarian | 6 |
| Incarnate Word Parish School | K-8 | 448 | 18 | Roman Catholic | 6 |
| Lutheran High School North | 6-12 | 335 | 12.7 | Lutheran Church (Missouri Synod) | 6 |
| Mqp School | PreK-8 | 338 | 16.4 | Roman Catholic | 6 |
| Mary Queen of Peace School | PreK-8 | 338 | 10.1 | Roman Catholic | 6 |
| Holy Cross Academy - Primary Campus | K-2 | 97 | 8.1 | Roman Catholic | 6 |
| Promise Christian Academy | K-12 | 41 | 3.2 | Presbyterian | 6 |
| Kirkwood Children's House | PreK-K | 12 | 6 | Nonsectarian | 6 |
| Eyc Academy | 3-12 | 56 | 7.7 | Nonsectarian | 7 |
| Ursuline Academy | 9-12 | 363 | 11.7 | Roman Catholic | 7 |
| Chesterfield Montessori School | K-6 | 48 | 8 | Nonsectarian | 7 |
| St. Gerard Majella Catholic School | PreK-8 | 457 | 13.8 | Roman Catholic | 7 |
| Westminster Christian Academy | 7-12 | 940 | 10.7 | Presbyterian | 7 |
| St. Louis University High School | 9-12 | 1,036 | 11.8 | Roman Catholic | 7 |
| Blessed Teresa of Calcutta School | K-8 | 160 | 12.4 | Roman Catholic | 7 |
| Christ Community Lutheran School | PreK-8 | 447 | 17.1 | Lutheran Church (Missouri Synod) | 7 |
| Greenways Academy | 1-12 | 3,015 | 91.1 | Nonsectarian | 7 |
| Central Institute for the Deaf | Ungraded | 18 | 1.5 | Nonsectarian | 7 |
| Raintree School | PreK-2 | 10 | 10 | Nonsectarian | 7 |
| St. Ambrose School | PreK-8 | 226 | 11.8 | Roman Catholic | 7 |
| South City Catholic Academy Learning Center | 2-8 | 14 | 5.4 | Roman Catholic | 7 |
| City Academy | PreK-6 | 182 | 5.4 | Nonsectarian | 7 |
| Rosati-Kain High School | 9-12 | 127 | 7.8 | Roman Catholic | 7 |
| St. Gabriel the Archangel School | K-8 | 475 | 15.3 | Roman Catholic | 7 |
| Word of Life Lutheran | PreK-8 | 173 | 14.5 | Lutheran Church (Missouri Synod) | 8 |
| The Fulton School | PreK-12 | 102 | 6.8 | Nonsectarian | 8 |
| Green Tree Montessori | PreK-K | 1 | 1 | Nonsectarian | 8 |
| South City Community School | PreK-8 | 184 | 15 | Christian (nondenominational) | 8 |
| Guidepost Montessori School | PreK-K | 34 | 34 | Nonsectarian | 8 |
| Al-Salam Day School | K-12 | 278 | 8.9 | Islamic | 8 |
| Christ Prince of Peace School | PreK-8 | 187 | 13.1 | Roman Catholic | 8 |
| North County Christian School | PreK-12 | 258 | 10.6 | Christian (nondenominational) | 8 |
| St. Louis Catholic Academy | K-8 | 137 | 11.5 | Roman Catholic | 8 |
| St. John Vianney High School | 9-12 | 581 | 11.6 | Roman Catholic | 8 |
| St. Raphael the Archangel School | PreK-8 | 170 | 13.2 | Roman Catholic | 8 |
| Holy Cross Academy | PreK-8 | 402 | 13.2 | Roman Catholic | 8 |
| Holy Cross Acadmey Early Childhood | PreK-Transitional K | 10 | 10 | Roman Catholic | 8 |
| Tower Grove Christian Academy | PreK-8 | 101 | 9.8 | Baptist | 8 |
| Montessori Lab School at Grand Center | PreK-5 | 91 | 22.8 | Nonsectarian | 8 |
| Loyola Academy of St. Louis | 4-8 | 77 | 8 | Roman Catholic | 8 |
| Map St. Louis | 7-12 | 32 | 5.8 | Nonsectarian | 8 |
| Cardinal Ritter College Prep High School | 9-12 | 453 | 13.3 | Roman Catholic | 8 |
| St. Margaret of Scotland School | PreK-8 | 384 | 17.6 | Roman Catholic | 8 |
| Marian Middle School | 6-8 | 44 | 6.3 | Roman Catholic | 9 |
| Barat Academy | 6-12 | 37 | 4 | Roman Catholic | 9 |
| River Roads Lutheran School | PreK-8 | 58 | 9.8 | Lutheran Church (Missouri Synod) | 9 |
| St. Justin Martyr School | PreK-8 | 169 | 11.7 | Roman Catholic | 9 |
| Salem Lutheran School | PreK-8 | 84 | 7.4 | Lutheran Church (Missouri Synod) | 9 |
| Sacred Heart Catholic School | PreK-8 | 363 | 15.5 | Roman Catholic | 9 |
| Cor Jesu Academy | 9-12 | 519 | 10.5 | Roman Catholic | 9 |
| Lutheran High School South | 9-12 | 550 | 13.4 | Lutheran Church (Missouri Synod) | 9 |
| Janan Academy | PreK-2 | 18 | 4.5 | Islamic | 9 |
| Thomas Jefferson School | 7-12 | 74 | 4 | Nonsectarian | 9 |
| Atonement Lutheran School | PreK-8 | 10 | 10 | Evangelical Lutheran Church in America | 9 |
| Academy of St. Louis | 1-12 | 36 | 5.7 | Roman Catholic | 9 |
| Academy of the Sacred Heart | PreK-8 | 164 | 9.9 | Roman Catholic | 9 |
| Immanuel Lutheran School | PreK-8 | 366 | 12.8 | Lutheran Church (Missouri Synod) | 9 |
| Grace Chapel Lutheran School | PreK-8 | 159 | 11.4 | Lutheran Church (Missouri Synod) | 10 |
| St. Stephen Protomartyr School | PreK-8 | 159 | 14.3 | Roman Catholic | 10 |
| St. Frances Cabrini Academy | K-8 | 185 | 14.8 | Roman Catholic | 10 |
| St. Mary's South Side Catholic High School | 9-12 | 203 | 9 | Roman Catholic | 10 |
| Al-Manara Academy | PreK-8 | 84 | 7.9 | Islamic | 10 |
| St. John Paul II Preparatory | PreK-12 | 176 | 7 | Roman Catholic | 10 |
| Tdw Academy | 9-12 | 84 | 21 | Christian (nondenominational) | 10 |
| St. Catherine Laboure School | K-8 | 482 | 17.7 | Roman Catholic | 10 |
| Sacred Heart Elementary School | PreK-8 | 179 | 11.5 | Roman Catholic | 10 |
| St. Cecilia School | Transitional 1st-8 | 178 | 14.4 | Roman Catholic | 10 |
| Providence Academy | PreK-12 | 150 | 8.2 | Christian (nondenominational) | 10 |
| Missouri Torah Institute | 9-12 | 73 | 7.4 | Jewish | 10 |
| Marygrove Services, Inc. | 4-9 | 2 | 2 | Roman Catholic | 10 |
| St. Simon the Apostle | PreK-8 | 128 | 9 | Roman Catholic | 10 |
| Ascension School | K-8 | 412 | 15.2 | Roman Catholic | 10 |
| Salem Lutheran School | PreK-8 | 105 | 11.7 | Lutheran Church (Missouri Synod) | 11 |
| Duchesne High School | 9-12 | 225 | 8.2 | Roman Catholic | 11 |
| Storman Lions Leadership Academy | PreK-8 | 25 | 5.4 | Nonsectarian | 11 |
| Grace Christian Academy | K-8 | 54 | 5.3 | Christian (nondenominational) | 11 |
| Green Park Lutheran School | PreK-8 | 216 | 13.7 | Lutheran Church (Missouri Synod) | 11 |
| Holy Infant Elementary School | PreK-8 | 420 | 16.3 | Roman Catholic | 11 |
| Seton Regional Catholic School | PreK-8 | 248 | 16.4 | Roman Catholic | 11 |
| Our Savior Lutheran Church & School | PreK-8 | 58 | 10.9 | Lutheran Church (Missouri Synod) | 11 |
| St. Clare of Assisi School | PreK-8 | 119 | 9.9 | Roman Catholic | 11 |
| St. Paul Catholic School | PreK-8 | 235 | 11.4 | Roman Catholic | 11 |
| Lesanto's Healing Hands Learning Center | PreK-Transitional K | 300 | 9.7 | Nonsectarian | 12 |
| Oak Bridge | PreK-6 | 38 | 12.7 | Nonsectarian | 12 |
| Cdlc Ellisville Inc. | PreK-Transitional K | 20 | 10 | Nonsectarian | 12 |
| Zion Lutheran School | PreK-8 | 364 | 18.3 | Lutheran Church (Missouri Synod) | 12 |
| Assumption Parish School | PreK-8 | 236 | 16.7 | Roman Catholic | 12 |