High Quality Content by WIKIPEDIA articles! The New York City Subway is a rapid transit system that serves four of the five boroughs of New York City in the U.S. state of New York: the Bronx, Brooklyn, Manhattan, and Queens. Its operator is the New York City Transit Authority, which is itself controlled by the Metropolitan Transportation Authority of New York. 7.922 million passengers use the system daily, making it the busiest rapid transit system in the United States and the fourth busiest in the world.