Aurora, illinois is 4.3 times larger than Sterling Heights, Michigan.
Area: 412 km2 calculated
Aurora is a city in DuPage, Kane, Kendall, and Will counties in the U.S. state of Illinois. The second most populous city in the state, it is the 19th largest city in the Midwest and the 112th largest city in the country. Wikipedia
Area: 95 km2 calculated
Sterling Heights is a city in Macomb County of the U.S. state of Michigan, and one of Detroit's core suburbs. As of the 2010 census, the city had a total population of 129,699. It is the second largest suburb in Metro Detroit, and the fourth largest city in Michigan. Wikipedia