Brooklyn is a borough of New York City, coextensive with Kings County, in the U.S. state of New York. It is the most populous county in the state, the second-most densely populated county in the United States, and New York City's most populous borough, with an estimated 2,648,403 residents in 2020. If each borough were ranked as a city, Brooklyn would rank as the third-most populous in the U.S., after Los Angeles and Chicago.
