Old Catonsville High School, also known as St. Mark's School, is a historic masonry school building located in Catonsville, Baltimore County, Maryland. Built in 1878, the school consists of a one-story, single bay structure and a three-story, four bay addition constructed in 1898.
In 1885, the school was designated as a high school, and in 1910, the property was sold to the Catholic Church. Listed on the National Register of Historic Places in 1987, Old Catonsville High School holds significance as a historic landmark in the local community.
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