Polk County is a county located in the U.S. state of Iowa. As of the most recent data available, the county has a population of approximately 374,601 people, with a population density of about 657.19 persons per square mile.
The county spans a total land area of 570.00 square miles (1,476.00 square kilometers). The administrative center and county seat is Des Moines, which often serves as a hub for local governance and services. The largest city within the county by population is Des Moines.
Geographically, Polk County experiences varied elevations, with its highest point at Sheldahl 1,037 ft and its lowest point at Altoona 0 ft. The region operates in the UTC-6.