Borough in New York City and county in New York, US
Brooklyn is a borough of New York City, coextensive with Kings County, in the U.S. state of New York. Kings County is the most populous county in the State of New York, as well as the second-most densely populated county in the United States. It is also New York City's most populous borough, with 2,736,074 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.