Most of Des Moines' commercial radio stations are owned by one of four companies.
The Des Moines-Ames media market consists of 35 central Iowa counties: Adair, Adams, Appanoose, Audubon, Boone, Calhoun, Carroll, Clarke, Dallas, Decatur, Franklin, Greene, Guthrie, Hamilton, Hardin, Humboldt, Jasper, Kossuth, Lucas, Madison, Mahaska, Marion, Marshall, Monroe, Pocahontas, Polk, Poweshiek, Ringgold, Story, Taylor, Union, Warren, Wayne, Webster, and Wright [REF].