Brooklyn () is the most populous borough of New York City, with a Census-estimated 2,629,150 residents in 2016. It borders the borough of Queens at the southwestern end of Long Island, and has several bridge connections to the nearby boroughs of Staten Island and Manhattan. Since 1896, Brooklyn has had the same boundaries as Kings County, the most populous county in the U.S. state of New York and the second-most densely populated county in the United States, after the county of New York (which is coextensive with the borough of Manhattan). 

With a land area of and water area of , Kings County is New York's fourth-smallest county by land area and third-smallest by total area, though it is the second-largest among the city's five boroughs. Today, if New York City dissolved, Brooklyn would rank as the third-most populous city in the U.S., behind Los Angeles and Chicago. 

Brooklyn was an independent incorporated city (and previously an authorized village and town within the provisions of the New York State Constitution) until January 1, 1898, when, after a long political campaign and public relations battle during the 1890s, according to the new Municipal Charter of "Greater New York", Brooklyn was consolidated with the other cities, boroughs, and counties to form the modern "City of New York," surrounding the Upper New York Bay with five constituent boroughs. The borough continues, however, to maintain a distinct culture. Many Brooklyn neighborhoods are ethnic enclaves. Brooklyn's official motto, displayed on the Borough seal and flag, is which translates from early modern Dutch as "Unity makes strength".
what city is the most populous in New York
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since when
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Brooklyn
Brooklyn () is the most populous borough of New York City
2,629,150 residents
with a Census-estimated 2,629,150 residents
the borough of Queens at the southwestern end of Long Island
It borders the borough of Queens at the southwestern end of Long Island
Kings County
Since 1896, Brooklyn has had the same boundaries as Kings County
1896
Since 1896, Brooklyn has had the same boundaries as Kings County
no
and the second-most densely populated county
New York
after the county of New York
Kings County
Kings County is New York's fourth-smallest county
third
if New York City dissolved, Brooklyn would rank as the third-most populous city in the U.S
Los Angeles
Brooklyn would rank as the third-most populous city in the U.S., behind Los Angeles and Chicago
Chicago
behind Los Angeles and Chicago. 
1898
until January 1, 1898, when
Unity makes strength
Brooklyn's official motto, displayed on the Borough seal and flag, is which translates from early modern Dutch as "Unity makes strength"