Des Moines Register: Ankeny is now Des Moines’ biggest suburb, the latest U.S. Census Bureau data shows. Long one of the country’s fastest-growing cities, Ankeny added another 2,400 residents from April 2020 to July 2021, according to the census’ vintage data series estimates, released Thursday. Those additional residents put the city’s population at 70,287, making it the second-largest in the metro behind Des Moines proper. Ankeny surpassed West Des Moines, which added about 1,000 residents from April 2020 to July 2021, putting the city’s population at 69,792.