Staten Island (NYC borough) is 3.9 times larger than Jersey City, New Jersey.
Area: 38 km2 calculated
Jersey City is the seat of Hudson County, New Jersey. As of the 2010 United States Census, the population of Jersey City was 247,597, making it the second-most populous city in New Jersey, after Newark. Wikipedia
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