Polk County is located in the U.S. state of Iowa. As of the 2020 census, the population was 492,401. It is Iowa's most populous county, and home to over 15% of the state's residents. The county seat is Des Moines, which is also the capital city of... Wikipedia
Population: 501,089 (2022)
Congressional district: 3rd
Founded: January 13, 1846
Largest city: Des Moines
Named for: James K. Polk