Aurora, Colorado is 43 times larger than Glendale, Arizona.
Area: 3 km2 calculated
Glendale is a city in Maricopa County, Arizona, United States, located about 9 miles northwest from Downtown Phoenix. According to the 2010 census, the population of the city is 226,721. Wikipedia
Area: 125 km2 calculated
The City of Aurora is a Home Rule Municipality in the State of Colorado, spanning Arapahoe and Adams counties, with the extreme southeastern portion of the city extending into Douglas County. Aurora is one of the principal cities of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area. Wikipedia