Chicago is 9.6 times larger than Newark, New Jersey.
Area: 608 km2 calculated
Chicago is the third most populous city in the United States, after New York City and Los Angeles. With 2.7 million residents, it is the most populous city in both the U.S. state of Illinois and the American Midwest. Wikipedia
Area: 63 km2 calculated
Newark is the largest city in the U.S. state of New Jersey, and the county seat of Essex County. Wikipedia