Staten Island (NYC borough) is 2.9 times larger than Yonkers, New York.
Area: 151 km2 calculated
Staten Island is one of the five boroughs of New York City, in the U.S. state of New York, located in the southwest part of the city. Staten Island is the southernmost part of the both the City and State of New York, with Conference House Park at the southern tip of the island and the state. Wikipedia
Area: 53 km2 calculated
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