St. Thomas School (STS) is a private, independent day school in Medina, WA serving Seattle and Bellevue students in Preschool through 8th grade.STS is one of the most established independent schools in Puget Sound and features a highly regarded preschool, elementary, and middle school curriculum that prepares students to excel at future endeavors while honoring the school's long-standing core values.Request ADA Seating