Trinity Catholic High School was a private, Catholic high school in Spanish Lake Township, St. Louis County, Missouri.

[2] Trinity Catholic was established in 2003 from the merger of St. Thomas Aquinas-Mercy and Rosary high schools to serve the northern portion of St. Louis County.

The archdiocese stated that it would be expensive to repair the building, and that area families chose other Catholic schools, which is why the number of students had declined.

[4] Had the school remained open, it would have had an expected 9th grade enrollment of 37 the following year.

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