Bethlehem continued as an elementary school until 1911, when St. Joseph Preparatory High School for boys was founded. The boys attended "St. Joe Prep", as the school was affectionately called, while girls continued their schooling at Bethlehem. Bethlehem's first high school graduating class was in 1913. From 1911 until 1953, Bethlehem continued as a co-educational elementary school, and a girls' high school. In the fall of 1953, St. Joseph Parochial Elementary School (now St. Joseph School), built by St. Joseph Parish, opened. Bethlehem was operated exclusively as a parish high school for girls, no longer owned by the Sisters, but staffed by them.