Newark, New Jersey is 65% larger than Jersey City, New Jersey.
Area: 38 km2 calculated
Population: 254,441 (2012)
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: 63 km2 calculated
Population: 277,727 (2012)
Newark is the largest city in the U.S. state of New Jersey, and the county seat of Essex County. Wikipedia