Most graduates of St. Mary's School attended high school at St. Thomas Aquinas in Florissant which later became St. Thomas Aquinas-Mercy after merging with Mercy High School in University City in September 1985.
Most graduates of St. Mary's School attended high school at St. Thomas Aquinas in Florissant. This St. Thomas Aquinas in Florissant later became St. Thomas Aquinas-Mercy after. This St. Thomas Aquinas in Florissant later was merging with Mercy High School in University City in September 1985.