West Des Moines is a city in Polk, Dallas, and Warren counties in the US state of Iowa. As of the 2010 census, the city population was 56,609. West Des Moines is the second-largest city in the Des Moines metropolitan area and the tenth-largest city in Iowa. It ranked 94th in Money magazine's list of the "100 Best Places to Live and Launch" in 2008. It is one of Iowa's largest and wealthiest cities and Des Moines's richest suburb.