While today’s school subdistrict boundaries were mostly established in the late 1960s, their historical roots are much older, dating back to the beginning of the 20th century, when New York City as we know it today was formed by consolidating what are now the five boroughs—the Bronx, Brooklyn, Manhattan, Queens, and Staten Island—into one unit. In 1902, a centralized board of education took control of the entire city school system, which was divided into 46 geographic school subdistricts, each with their own local board and administrator
https://journals.sagepub.com/doi/full/10.1177/23328584211038939