District 1
Howard, Winneshiek, Allamakee, Chickasaw, Bremer, Fayette, Clayton, Black Hawk, Buchanan, Delaware, Dubuque

District 2
Tama, Benton, Linn, Jones, Jackson, Iowa, Johnson, Cedar, Clinton, Scott, Muscatine

District 3
Keokuk, Washington, Louisa, Lucas, Monroe, Wapello, Jefferson, Henry, Des Moines, Wayne, Appanoose, Davis, Van Buren, Lee

District 4
Pottawattamie, Cass, Adair, Madison, Mills, Montgomery, Adams, Union, Clarke, Fremont, Page, Taylor, Ringgold, Decatur

District 5
Woodbury, Ida, Sac, Calhoun, Monona, Crawford, Carroll, Greene, Harrison, Shelby, Audubon, Guthrie

District 6
Boone, Story, Marshall, Dallas, Polk, Jasper, Poweshiek, Warren, Marion, Mahaska

District 7
Lyon, Osceola, Dickinson, Emmet, Sioux, O’Brien, Clay, Palo Alto, Plymouth, Cherokee, Buena Vista, Pocahontas

District 8
Kossuth, Winnebago, Worth, Mitchell, Hancock, Cerro Gordo, Floyd, Humboldt, Wright, Franklin, Butler, Webster, Hamilton, Hardin, Grundy