Joliet, Illinois is 2,119 times larger than Centennial, Colorado.
Area: 0 km2 calculated
The City of Centennial is a Home Rule City located in Arapahoe County, Colorado, United States, and part of the Denver-Aurora metropolitan area. The city had a total population of 100,377 in 2010 census. 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