Des Moines is the capital and the most populous city in the U.S. state of Iowa. It is the county seat of Polk County and is located in central Iowa on the Des Moines River, which divides the city into east and west sections. It is Iowa's cultural, economic, and governmental hub. As of the 2020 census, the city's population was 214,133, an increase from 203,433 in 2010.