It’s a bit more complicated. There’s both a political division, which is NYC containing all five boroughs, and the postal code, division.

Unfortunately, for mailing stuff even the people who live in the city refuse to stop putting Brooklyn or New York, NY as the mailing address. This is because each borough at some point in time used to be a city or multiple cities, in the case of Queens and Bronx, or “The Bronx.” These last two boroughs have multiple cities up to this days, which can be seen when mailing address to places like Jamaica and Riverdale in which you would write the address as Riverdale, NY or Jamaica, NY.

Pretty confusing, right?