Which borough does not belong to New York City?

Nassau County is the correct answer because it is not a borough of New York City. New York City consists of five boroughs: Brooklyn, Staten Island, Manhattan, Queens, and the Bronx. Each of these boroughs has its own unique characteristics and governance, contributing to the city's overall diversity and culture. Nassau County, on the other hand, is located on Long Island but operates independently from New York City and is part of the larger Nassau County government structure. Recognizing the distinction between New York City's boroughs and surrounding counties is important for understanding the structure of local government and urban geography in this region.