All Hallows High School at 111 East 164th Street goes coed this month with the admission of some freshman girls. Please see the school's website linked HERE.
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The word Hallows means Saints. The Irish Christian Brothers ran a successful high school at All Saints parish at East 129th Street and Madison Avenue.
Its history may be found at https://en.wikipedia.org/wiki/All_Hallows_High_School
The school is about 0.3 mile east of the new Yankee Stadium.