Kansas City, Kansas is 2.7 times larger than McAllen, Texas.
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: 125 km2 calculated
McAllen is the twenty-second most populous city in Texas and the largest city in Hidalgo County, Texas. It is located at the southern tip of Texas in the Rio Grande Valley, and is part of the Southern United States. Wikipedia