Kansas City, Kansas is 6.3 times larger than Yonkers, New York.
Area: 332 km2 calculated
Kansas City is the third-largest city in the state of Kansas, the county seat of Wyandotte County, and the third-largest city of the Kansas City metropolitan area. It is part of a consolidated city-county government known as the "Unified Government". Wikipedia
Area: 53 km2 calculated
Yonkers is the fourth most populous city in the U.S. state of New York, and the most populous city in Westchester County, with a population of 195,976. Wikipedia