Brooklyn (NYC borough) is 3.4 times larger than Yonkers, New York.
Area: 180 km2 calculated
Population: 2,565,635 (2012)
Brooklyn is the most populous of New York City's five boroughs, with about 2.6 million people, as well as the second-largest in area. Wikipedia
Area: 53 km2 calculated
Population: 198,449 (2012)
Yonkers is the fourth most populous city in the U.S. state of New York, and the most populous city in Westchester County, with a population of 195,976. Wikipedia