| Salem Lutheran School | Affton | PreK-8 | 84 | 7.4 | Lutheran Church (Missouri Synod) |
| Barat Academy | Ballwin | 6-12 | 37 | 4 | Roman Catholic |
| Holy Infant Elementary School | Ballwin | PreK-8 | 420 | 16.3 | Roman Catholic |
| Salem Lutheran School | Black Jack | PreK-8 | 105 | 11.7 | Lutheran Church (Missouri Synod) |
| St. Mary Magdalen School | Brentwood | PreK-8 | 150 | 11.6 | Roman Catholic |
| Ascension School | Chesterfield | K-8 | 412 | 15.2 | Roman Catholic |
| Chesterfield Montessori School | Chesterfield | K-6 | 48 | 8 | Nonsectarian |
| Eyc Academy | Chesterfield | 3-12 | 56 | 7.7 | Nonsectarian |
| Incarnate Word Parish School | Chesterfield | K-8 | 448 | 18 | Roman Catholic |
| Missouri Torah Institute | Chesterfield | 9-12 | 73 | 7.4 | Jewish |
| The Fulton School | Chesterfield | PreK-12 | 102 | 6.8 | Nonsectarian |
| The Goddard School | Chesterfield | PreK-K | 10 | 10 | Nonsectarian |
| Our Lady of Lourdes School | Clayton | PreK-8 | 260 | 12.6 | Roman Catholic |
| The Wilson School | Clayton | PreK-6 | 147 | 6.8 | Nonsectarian |
| St. Clement Grade School | Des Peres | PreK-8 | 275 | 11.5 | Roman Catholic |
| St. Paul's Lutheran School | Des Peres | K-8 | 212 | 12.2 | Lutheran Church (Missouri Synod) |
| Cdlc Ellisville Inc. | Ellisville | PreK-Transitional K | 20 | 10 | Nonsectarian |
| St. Clare of Assisi School | Ellisville | PreK-8 | 119 | 9.9 | Roman Catholic |
| St. John Lutheran School | Ellisville | K-8 | 175 | 12.7 | Lutheran Church (Missouri Synod) |
| Most Sacred Heart School | Eureka | PreK-8 | 178 | 14.8 | Roman Catholic |
| St. Mark's Lutheran School | Eureka | PreK-8 | 42 | 7 | Lutheran Church (Missouri Synod) |
| Messenger Christian School | Fenton | 2-8 | 4 | 4 | Latter Day Saints |
| Our Savior Lutheran Church & School | Fenton | PreK-8 | 58 | 10.9 | Lutheran Church (Missouri Synod) |
| St. Paul Catholic School | Fenton | PreK-8 | 235 | 11.4 | Roman Catholic |
| Blessed Teresa of Calcutta School | Ferguson | K-8 | 160 | 12.4 | Roman Catholic |
| All Saints Academy - St. Norbert Campus | Florissant | PreK-8 | 211 | 15.7 | Roman Catholic |
| Atonement Lutheran School | Florissant | PreK-8 | 10 | 10 | Evangelical Lutheran Church in America |
| Grace Christian Academy | Florissant | K-8 | 54 | 5.3 | Christian (nondenominational) |
| Marygrove Services, Inc. | Florissant | 4-9 | 2 | 2 | Roman Catholic |
| North County Christian School | Florissant | PreK-12 | 258 | 10.6 | Christian (nondenominational) |
| Oak Bridge | Florissant | PreK-6 | 38 | 12.7 | Nonsectarian |
| Sacred Heart Catholic School | Florissant | PreK-8 | 363 | 15.5 | Roman Catholic |
| Christ Community Lutheran School | Kirkwood | PreK-8 | 447 | 17.1 | Lutheran Church (Missouri Synod) |
| Green Tree Montessori | Kirkwood | PreK-K | 1 | 1 | Nonsectarian |
| Kirkwood Children's House | Kirkwood | PreK-K | 12 | 6 | Nonsectarian |
| St. Gerard Majella Catholic School | Kirkwood | PreK-8 | 457 | 13.8 | Roman Catholic |
| St. John Vianney High School | Kirkwood | 9-12 | 581 | 11.6 | Roman Catholic |
| Villa Di Maria Montessori School | Kirkwood | PreK-6 | 98 | 14 | Nonsectarian |
| Academy of St. Louis | Manchester | 1-12 | 36 | 5.7 | Roman Catholic |
| Al-Manara Academy | Manchester | PreK-8 | 84 | 7.9 | Islamic |
| Al-Salam Day School | Manchester | K-12 | 278 | 8.9 | Islamic |
| Christ Prince of Peace School | Manchester | PreK-8 | 187 | 13.1 | Roman Catholic |
| Giant Steps of St. Louis | Maplewood | Transitional 1st-12 | 28 | 2.5 | Nonsectarian |
| Dayspring Academy | Maryland Heights | PreK-12 | 70 | 11.7 | Christian (nondenominational) |
| Holy Spirit Catholic School | Maryland Heights | PreK-8 | 174 | 14.5 | Roman Catholic |
| Hillcrest Sda School | Olivette | K-9 | 29 | 9.7 | Seventh-Day Adventist |
| Immanuel Lutheran School | Olivette | PreK-8 | 100 | 10.8 | Lutheran Church (Missouri Synod) |
| Logos School | Olivette | 6-12 | 106 | 5 | Nonsectarian |
| Abiding Savior Lutheran School | Saint Louis | K-8 | 186 | 15.5 | Lutheran Church (Missouri Synod) |
| Agape Academy & Child Development Center | Saint Louis | PreK-4 | 28 | 9.3 | Christian (nondenominational) |
| Annunziata School | Saint Louis | Ungraded | 18 | 6.4 | Roman Catholic |
| Assumption Parish School | Saint Louis | PreK-8 | 236 | 16.7 | Roman Catholic |
| Cardinal Ritter College Prep High School | Saint Louis | 9-12 | 453 | 13.3 | Roman Catholic |
| Central Christian School | Saint Louis | PreK-6 | 171 | 8.8 | Presbyterian |
| Central Institute for the Deaf | Saint Louis | Ungraded | 18 | 1.5 | Nonsectarian |
| Chaminade College Preparatory School | Saint Louis | 6-12 | 872 | 10.3 | Roman Catholic |
| Christ the King Catholic School | Saint Louis | PreK-8 | 186 | 9.1 | Roman Catholic |
| Christian Academy of Greater St. Louis | Saint Louis | PreK-12 | 103 | 7.7 | Church of Christ |
| City Academy | Saint Louis | PreK-6 | 182 | 5.4 | Nonsectarian |
| Community School | Saint Louis | PreK-6 | 305 | 6.8 | Nonsectarian |
| Cor Jesu Academy | Saint Louis | 9-12 | 519 | 10.5 | Roman Catholic |
| Crossroads College Preparatory School | Saint Louis | 7-12 | 125 | 6.3 | Nonsectarian |
| Ech School at Every Childs Hope | Saint Louis | 1-12 | 34 | 8.5 | Nonsectarian |
| Esther Miller Bais Yaakov | Saint Louis | 9-12 | 36 | 2.2 | Jewish |
| Faith Academy | Saint Louis | PreK-K | 5 | 3.3 | Nonsectarian |
| Grace Chapel Lutheran School | Saint Louis | PreK-8 | 159 | 11.4 | Lutheran Church (Missouri Synod) |
| Green Park Lutheran School | Saint Louis | PreK-8 | 216 | 13.7 | Lutheran Church (Missouri Synod) |
| Greenways Academy | Saint Louis | 1-12 | 3,015 | 91.1 | Nonsectarian |
| Guidepost Montessori School | Saint Louis | PreK-K | 34 | 34 | Nonsectarian |
| H.f. Epstein Hebrew Academy | Saint Louis | PreK-12 | 109 | 3.5 | Jewish |
| Holy Cross Academy | Saint Louis | PreK-8 | 402 | 13.2 | Roman Catholic |
| Holy Cross Academy - Primary Campus | Saint Louis | K-2 | 97 | 8.1 | Roman Catholic |
| Holy Cross Acadmey Early Childhood | Saint Louis | PreK-Transitional K | 10 | 10 | Roman Catholic |
| Immacolata School | Saint Louis | PreK-8 | 264 | 12.6 | Roman Catholic |
| Incarnate Word Academy | Saint Louis | 9-12 | 235 | 9.2 | Roman Catholic |
| International Schoolhouse | Saint Louis | PreK-2 | 19 | 4.3 | Nonsectarian |
| Janan Academy | Saint Louis | PreK-2 | 18 | 4.5 | Islamic |
| Kvc Academy | Saint Louis | K-12 | 61 | 6.8 | Nonsectarian |
| Lesanto's Healing Hands Learning Center | Saint Louis | PreK-Transitional K | 300 | 9.7 | Nonsectarian |
| Little Flower Catholic School | Saint Louis | K-8 | 80 | 7.7 | Roman Catholic |
| Loyola Academy of St. Louis | Saint Louis | 4-8 | 77 | 8 | Roman Catholic |
| Lutheran High School North | Saint Louis | 6-12 | 335 | 12.7 | Lutheran Church (Missouri Synod) |
| Lutheran High School South | Saint Louis | 9-12 | 550 | 13.4 | Lutheran Church (Missouri Synod) |
| Map St. Louis | Saint Louis | 7-12 | 32 | 5.8 | Nonsectarian |
| Marian Middle School | Saint Louis | 6-8 | 44 | 6.3 | Roman Catholic |
| Micds | Saint Louis | PreK-12 | 1,220 | 8.9 | Nonsectarian |
| Miriam High School | Saint Louis | 9-12 | 48 | 4.4 | Nonsectarian |
| Montessori Lab School at Grand Center | Saint Louis | PreK-5 | 91 | 22.8 | Nonsectarian |
| Oltc Institute | Saint Louis | 3-12 | 26 | 4.3 | Nonsectarian |
| Our Lady of the Pillar School | Saint Louis | PreK-8 | 113 | 10 | Roman Catholic |
| Principia School | Saint Louis | PreK-12 | 423 | 7.7 | Other religious |
| Providence Academy | Saint Louis | PreK-12 | 150 | 8.2 | Christian (nondenominational) |
| Queen of All Saints School | Saint Louis | PreK-8 | 356 | 14.9 | Roman Catholic |
| Raintree School | Saint Louis | PreK-2 | 10 | 10 | Nonsectarian |
| River Roads Lutheran School | Saint Louis | PreK-8 | 58 | 9.8 | Lutheran Church (Missouri Synod) |
| Rohan Woods School | Saint Louis | PreK-6 | 68 | 3.4 | Nonsectarian |
| Rosati-Kain High School | Saint Louis | 9-12 | 127 | 7.8 | Roman Catholic |
| Saul Mirowitz Jewish Community School | Saint Louis | K-8 | 149 | 5.7 | Jewish |
| South City Catholic Academy Learning Center | Saint Louis | 2-8 | 14 | 5.4 | Roman Catholic |
| South City Community School | Saint Louis | PreK-8 | 184 | 15 | Christian (nondenominational) |
| St. Ambrose School | Saint Louis | PreK-8 | 226 | 11.8 | Roman Catholic |
| St. Ann Catholic School | Saint Louis | PreK-8 | 184 | 13.1 | Roman Catholic |
| St. Catherine Laboure School | Saint Louis | K-8 | 482 | 17.7 | Roman Catholic |
| St. Cecilia School | Saint Louis | Transitional 1st-8 | 178 | 14.4 | Roman Catholic |
| St. Frances Cabrini Academy | Saint Louis | K-8 | 185 | 14.8 | Roman Catholic |
| St. Francis of Assisi School | Saint Louis | PreK-8 | 247 | 11.5 | Roman Catholic |
| St. Gabriel the Archangel School | Saint Louis | K-8 | 475 | 15.3 | Roman Catholic |
| St. Joseph's Academy | Saint Louis | 9-12 | 587 | 12 | Roman Catholic |
| St. Justin Martyr School | Saint Louis | PreK-8 | 169 | 11.7 | Roman Catholic |
| St. Louis Catholic Academy | Saint Louis | K-8 | 137 | 11.5 | Roman Catholic |
| St. Louis Modern Chinese School | Saint Louis | K-12 | 229 | 47.7 | Nonsectarian |
| St. Louis Priory School | Saint Louis | 7-12 | 299 | 8.4 | Roman Catholic |
| St. Louis University High School | Saint Louis | 9-12 | 1,036 | 11.8 | Roman Catholic |
| St. Margaret Mary Alacoque School | Saint Louis | PreK-8 | 397 | 17.4 | Roman Catholic |
| St. Margaret of Scotland School | Saint Louis | PreK-8 | 384 | 17.6 | Roman Catholic |
| St. Mary's South Side Catholic High School | Saint Louis | 9-12 | 203 | 9 | Roman Catholic |
| St. Raphael the Archangel School | Saint Louis | PreK-8 | 170 | 13.2 | Roman Catholic |
| St. Roch School | Saint Louis | PreK-8 | 130 | 11.2 | Roman Catholic |
| St. Simon the Apostle | Saint Louis | PreK-8 | 128 | 9 | Roman Catholic |
| St. Stephen Protomartyr School | Saint Louis | PreK-8 | 159 | 14.3 | Roman Catholic |
| Ste Genevieve Du Bois School | Saint Louis | PreK-8 | 172 | 12 | Roman Catholic |
| Storman Lions Leadership Academy | Saint Louis | PreK-8 | 25 | 5.4 | Nonsectarian |
| Tdw Academy | Saint Louis | 9-12 | 84 | 21 | Christian (nondenominational) |
| The College School | Saint Louis | PreK-8 | 179 | 6.7 | Nonsectarian |
| The Freedom School | Saint Louis | PreK-8 | 115 | 9.7 | Presbyterian |
| The St. Michael School of Clayton | Saint Louis | PreK-8 | 71 | 3.2 | Episcopal |
| The Waldorf School of St. Louis | Saint Louis | PreK-8 | 56 | 4 | Nonsectarian |
| Thomas Jefferson School | Saint Louis | 7-12 | 74 | 4 | Nonsectarian |
| Torah Prep School | Saint Louis | PreK-8 | 229 | 9.5 | Jewish |
| Torah Prep School - Boys Division | Saint Louis | PreK-8 | 229 | 12.1 | Jewish |
| Torah Prep School of St. Louis | Saint Louis | PreK-8 | 227 | 3.5 | Jewish |
| Tower Grove Christian Academy | Saint Louis | PreK-8 | 101 | 9.8 | Baptist |
| Ursuline Academy | Saint Louis | 9-12 | 363 | 11.7 | Roman Catholic |
| Victory Christian Academy | Saint Louis | K-12 | 96 | 6.8 | Christian (nondenominational) |
| Villa Duchesne School | Saint Louis | PreK-12 | 459 | 3.8 | Roman Catholic |
| Villa Duchesne Upper and Lower School | Saint Louis | PreK-12 | 465 | 8.9 | Roman Catholic |
| Visitation Academy | Saint Louis | PreK-12 | 555 | 8.9 | Roman Catholic |
| Whitfield School | Saint Louis | 6-12 | 407 | 9.1 | Nonsectarian |
| Word of Life Lutheran | Saint Louis | PreK-8 | 173 | 14.5 | Lutheran Church (Missouri Synod) |
| Covenant Christian School | Town and Country | PreK-6 | 140 | 10.8 | Presbyterian |
| Harper School, Llc | Town and Country | PreK-1 | 3 | 3 | Nonsectarian |
| Promise Christian Academy | Town and Country | K-12 | 41 | 3.2 | Presbyterian |
| Westminster Christian Academy | Town and Country | 7-12 | 940 | 10.7 | Presbyterian |
| Sacred Heart Elementary School | Valley Park | PreK-8 | 179 | 11.5 | Roman Catholic |
| Holy Redeemer School | Webster Groves | PreK-8 | 223 | 13.6 | Roman Catholic |
| Mary Queen of Peace School | Webster Groves | PreK-8 | 338 | 10.1 | Roman Catholic |
| Miriam School | Webster Groves | Ungraded | 111 | 10.1 | Nonsectarian |
| Mqp School | Webster Groves | PreK-8 | 338 | 16.4 | Roman Catholic |
| Hope Montessori Academy Wildwood | Wildwood | PreK-K | 5 | 5 | Nonsectarian |
| Living Water Academy | Wildwood | PreK-10 | 259 | 12.6 | Baptist |
| St. Alban Roe School | Wildwood | PreK-8 | 164 | 9.9 | Roman Catholic |