Chicago is 27% larger than Scottsdale, Arizona.
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: 478 km2 calculated
Scottsdale is a city in the eastern part of Maricopa County, Arizona, adjacent to the Greater Phoenix Area. According to the U.S. Census Bureau, as of 2010 the population of the city was 217,385. Wikipedia