Des Moines, Iowa is 4.7 times larger than Salinas, California.
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: 50 km2 calculated
Salinas is the county seat and largest municipality of Monterey County, California. Salinas is located 10 miles east-southeast of the mouth of the Salinas River, at an elevation of about 52 feet above sea level. The population was 163,665 at the 2014 census. Wikipedia