Des Moines, Iowa is 2.6 times larger than Kent, Washington.
Area: 235 km2 calculated
Des Moines is the capital and the most populous city in the U.S. state of Iowa. It is also the county seat of Polk County. A small portion of the city extends into Warren County. It was incorporated on September 22, 1851, as Fort Des Moines which was shortened to "Des Moines" in 1857. Wikipedia
Area: 90 km2 calculated
Kent is a city located in King County, Washington, United States. It is the sixth largest city in the state and third largest in the county. Kent is in the heart of the Seattle-Tacoma metroplex, located 19 miles south of Seattle and 19 miles northeast of Tacoma. Wikipedia