40CONGRESSIONAL DISTRICTS40.1Congressional districts.The state of Iowa is hereby organized and divided into four congressional districts, which shall be composed, respectively, of the following counties:1The first district shall consist of the counties of Cedar, Clinton, Des Moines, Henry, Iowa, Jackson, Jasper, Jefferson, Johnson, Jones, Keokuk, Lee, Louisa, Mahaska, Marion, Muscatine, Scott, Van Buren, Warren, and Washington.2The second district shall consist of the counties of Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo, Chickasaw, Clayton, Delaware, Dubuque, Fayette, Floyd, Grundy, Hardin, Howard, Linn, Mitchell, Poweshiek, Tama, Winneshiek, and Worth.3The third district shall consist of the counties of Adair, Adams, Appanoose, Cass, Clarke, Dallas, Davis, Decatur, Greene, Guthrie, Lucas, Madison, Monroe, Montgomery, Page, Polk, Ringgold, Taylor, Union, Wapello, and Wayne.4The fourth district shall consist of the counties of Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford, Dickinson, Emmet, Franklin, Fremont, Hamilton, Hancock, Harrison, Humboldt, Ida, Kossuth, Lyon, Marshall, Mills, Monona, O’Brien, Osceola, Palo Alto, Plymouth, Pocahontas, Pottawattamie, Sac, Shelby, Sioux, Story, Webster, Winnebago, Woodbury, and Wright.[C27, 31, 35, §526-a1; C39, §526.1; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §40.1; 81 Acts 2d Ex, ch 1, §1]91 Acts, ch 223, §1; 2001 Acts, 1st Ex, ch 1, §1, 62011 Acts, ch 76, §1, 6; 2021 Acts, 2nd Ex, ch 2, §1, 6Constitutional provision, Iowa Constitution, Art. III, §37Membership beginning in 2023; vacancies prior to 2023; see 2021 Acts, 2nd Ex, ch 2, §3, 4