Des Moines, Iowa is 96% larger than Fargo, North Dakota.
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: 120 km2 calculated
Fargo is the largest city in the State of North Dakota, accounting for nearly 16% of the state population. Fargo is also the county seat of Cass County. According to the 2013 United States Census estimates, its population was 113,658. Wikipedia