Joliet, Illinois is 92% larger than Ann Arbor, Michigan.
Area: 77 km2 calculated
Ann Arbor is a city in the US state of Michigan and the county seat of Washtenaw County. The 2010 census recorded its population to be 113,934, making it the sixth largest city in Michigan. Wikipedia
Area: 147 km2 calculated
Joliet is a city in Will and Kendall counties in the US state of Illinois, located 40 miles southwest of Chicago. It is the county seat of Will County. As of the 2010 census, the city was the fourth-most populated in Illinois, with a population of 147,433. Wikipedia