| St. Anthony School | Robstown | Private school | K–8 | 0 |
| St. Augustin Catholic High School | Fort Worth | Private school | 8–12 | 0 |
| St. Augustine Catholic School | Houston | Private school | K–8 | 0 |
| St. Augustine Elementary & Middle School | Laredo | Private school | PK–8 | 0 |
| St. Augustine High School | Laredo | Private school | 9–12 | 0 |
| St. Austin Catholic School | Austin | Private school | PK–8 | 0 |
| St. Bernard Of Clairvaux School | Dallas | Private school | PK–8 | 0 |
| St. Catherine's Montessori | Houston | Private school | PK–12 | 0 |
| St. Cecilia Catholic School | Houston | Private school | PK–8 | 0 |
| St. Cyprian's Episcopal School | Lufkin | Private school | PK–10 | 0 |
| St. Davids Episcopal School | San Antonio | Private school | PK–K | 0 |
| St. Dominic Savio Catholic High School | Austin | Private school | 9–12 | 0 |
| St. Edward Catholic School | Spring | Private school | PK–8 | 0 |
| St. Elizabeth Ann Seton School | Houston | Private school | PK–8 | 0 |
| St. Elizabeth Catholic School | Alice | Private school | PK–6 | 0 |
| St. Elizabeth Of Hungary Catholic School | Dallas | Private school | PK–8 | 0 |
| St. Francis De Sales School | Houston | Private school | PK–8 | 0 |
| St. Francis Episcopal School | Houston | Private school | PK–12 | 0 |
| St. Francis Episcopal School | Temple | Private school | PK–K | 0 |
| St. Francis School | Austin | Private school | 12 | 0 |
| St. Gabriel's Catholic School | Austin | Private school | PK–8 | 0 |
| St. George Catholic School | Fort Worth | Private school | PK–8 | 0 |
| St. George Episcopal School | San Antonio | Private school | K–8 | 0 |
| St. Gerard Catholic School | San Antonio | Private school | 6–12 | 0 |
| St. Gregory The Great Catholic School | San Antonio | Private school | PK–8 | 0 |
| St. Helen Catholic School | Georgetown | Private school | PK–8 | 0 |
| St. Helen Catholic School | Pearland | Private school | PK–8 | 0 |
| St. Helenas Episcopal School | Boerne | Private school | PK–5 | 0 |
| St. Ignatius College Prep | Fort Worth | Private school | 9–12 | 0 |
| St. Ignatius Loyola Early Childhood Center | Spring | Private school | PK–K | 0 |
| St. Ignatius Martyr Catholic School | Austin | Private school | K–8 | 0 |
| St. James Catholic School | Seguin | Private school | K–8 | 0 |
| St. James Day School | Texarkana | Private school | PK–8 | 0 |
| St. James Episcopal School | Del Rio | Private school | PK–5 | 0 |
| St. James Episcopal School | Corpus Christi | Private school | PK–8 | 0 |
| St. James Episcopal School Of Dallas | Dallas | Private school | PK–K | 0 |
| St. James The Apostle School | San Antonio | Private school | PK–8 | 0 |
| St. Jerome Catholic School | Houston | Private school | K–8 | 0 |
| St. John Berchmans School | San Antonio | Private school | K–8 | 0 |
| St. John Bosco School | San Antonio | Private school | PK–8 | 0 |
| St. John Lutheran Preschool Kinder/bridge | Hamilton | Private school | PK–K | 0 |
| St. John Paul II High School | Corpus Christi | Private school | 9–12 | 0 |
| St. John The Apostle Catholic | North Richland Hills | Private school | K–8 | 0 |
| St. John Xxiii College Prreparatory | Katy | Private school | 9–12 | 0 |
| St. Johns Episcopal Day School | McAllen | Private school | PK–6 | 0 |
| St. Johns Episcopal School | Abilene | Private school | PK–5 | 0 |
| St. Joseph Academy | Brownsville | Private school | 7–12 | 0 |
| St. Joseph Catholic Academy | Killeen | Private school | PK–9 | 0 |
| St. Joseph Catholic Elementary & Montessotir School | Amarillo | Private school | PK–5 | 0 |
| St. Joseph Catholic School | Edinburg | Private school | PK–8 | 0 |