The Bronx is the northernmost of the five boroughs of New York City in the U.S. state of New York, located south of Westchester County. Many bridges and tunnels link the Bronx to the island and borough of Manhattan to the west over and under the narrow Harlem River, as well as three longer bridges south over the East River to the borough of Queens. Of the five boroughs, the Bronx is the only one on the U.S. mainland and, with a land area of and a population of 1,438,159 in 2014, has the fourth largest land area, the fourth highest population, and the third-highest population density.