Founded in 1951 and located on the Eastside of Seattle in Medina, Washington, St. Thomas School (STS) is a private, non-sectarian school for preschool through 8th grade students. 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.