Iowa congressional district tables, 1847-2032

1 2 3 4 5 6 7 8 9 10 11

1847 1847 1862 1862 1862- 2012 1862- 1992 1872- 1972 1872- 1962 1872- 1942 1882- 1932 1882- 1932

1857 1862 1872 1882 1886 1932 1942 1962 1972 1982 1992 2002 2012 2022

Adair

Adams

Allamakee

Appanoose

Audubon

Benton

Black Hawk

Boone

Bremer

Buchanan

Buena Vista

Butler

Calhoun

Carroll

Cass

Cedar

Cerro Gordo

Cherokee

Chickasaw

Clarke

Clay

Clayton

Clinton

Crawford

Dallas

1 2 3 4 5 6 7 8 9 10 11

1847 1847 1862 1862 1862- 2012 1862- 1992 1872- 1972 1872- 1962 1872- 1942 1882- 1932 1882- 1932

1857 1862 1872 1882 1886 1932 1942 1962 1972 1982 1992 2002 2012 2022

Davis

Decatur

Delaware

Des Moines

Dickinson

Dubuque

Emmet

Fayette

Floyd

Franklin

Fremont

Greene

Grundy

Guthrie

Hamilton

Hancock

Hardin

Harrison

Henry

Howard

Humboldt

Ida

Iowa

Jackson

Jasper

1 2 3 4 5 6 7 8 9 10 11

1847 1847 1862 1862 1862- 2012 1862- 1992 1872- 1972 1872- 1962 1872- 1942 1882- 1932 1882- 1932

1857 1862 1872 1882 1886 1932 1942 1962 1972 1982 1992 2002 2012 2022

Jefferson

Johnson

Jones

Keokuk

Kossuth

Lee

Linn

Louisa

Lucas

Lyon

Madison

Mahaska

Marion

Marshall

Mills

Mitchell

Monona

Monroe

Montgomery

Muscatine

O'Brien

Osceola

Page

Palo Alto

Plymouth

1 2 3 4 5 6 7 8 9 10 11

1847 1847 1862 1862 1862- 2012 1862- 1992 1872- 1972 1872- 1962 1872- 1942 1882- 1932 1882- 1932

1857 1862 1872 1882 1886 1932 1942 1962 1972 1982 1992 2002 2012 2022

Pocahontas

Polk

Pottawattamie

Poweshiek

Ringgold

Sac

Scott

Shelby

Sioux

Story

Tama

Taylor

Union

Van Buren

Wapello

Warren

Washington

Wayne

Webster

Winnebago

Winneshiek

Woodbury

Worth

Wright

Sources: The Historical Atlas of United States Congressional Districts, 1789-1983; The Des Moines Register, 8/13/81; Iowa Legislature website

Always together since 1862 (1-exception counties noted):

11: Lyon, Dickinson, Osceola, Sioux, O'Brien, Clay, Plymouth, Cherokee, Buena Vista, Woodbury, Ida. Also Sac except 1981.
6: Washington, Jefferson, Henry, Des Moines, Lee, Van Buren. Also Louisa except 1992.
6 (almost): Emmet, Palo Alto, Pocahontas, Kossuth, Humboldt, Calhoun, except Kossuth and Humboldt in 1882 and Calhoun in 1982.
5 (almost): Harrison, Shelby, Audubon, Pottawattamie, Mills, also Fremont except 1886, split 3-2 in 2012.
4: Jasper, Keokuk, Mahaska, Monroe, except Jasper in 1982.
4 (almost): Mitchell, Howard, Floyd, Chickasaw, split 2-2 in 2012.
3: Emmet, Palo Alto, Pocahontas; Keokuk, Mahaska, Monroe; Adams, Taylor, Page.
3 (almost): Hardin, Franklin, Wright, except Wright in 1942 and Hardin in 2022; Buchanan, Delaware, Dubuque, except Dubuque in 1932 and Buchanan in 1972; Clarke, Decatur, Wayne except Wayne in 2002; Monroe, Wapello, Davis except Davis in 1862 and Monroe in 2002; Allamakee, Clayton, Fayette, except Allamakee in 2002.
2: Union/Ringgold; Clarke/Decatur; Fayette/Clayton; Kossuth/Humboldt; Adair/Guthrie
2 with one exception: Butler/Black Hawk (2012); Greene/Carroll (2002); Jackson/Clinton (1992); Allamakee/Winneshiek (1982); Jasper/Mahaska (1982); Franklin/Hardin (2022); Winnebago/Hancock (1972); Delaware/Dubuque (1932); Buchanan/Delaware (1972); Wapello/Davis (1862); Decatur/Wayne (2002); Dallas/Madison (1982)

The 2012 redistricting created a second exception for these county sets:

5: Union, Ringgold, Clarke, Decatur, Wayne, except 1872 (split 2-3) and Wayne in 2002. Split 3-2 in 2012.
3 (almost): Butler, Bremer, Black Hawk, except Bremer in 1862. Split 2-1 in 2012.

Always together in 20th Cty. redistricting (1932-92): Northwest 11, southwest 7 plus Harrison/Shelby/Audubon/ Guthrie/Adair, Greene/Carroll, north-central 5, Hardin/Franklin, Allamakee/Fayette/Clayton/Delaware, Louisa/Muscatine, southeast 6; Black Hawk/Butler/Bremer/Grundy, Union/Clarke/Ringgold/Decatur/Wayne, Linn/Jones/Clinton, Dubuque/Jackson, Mitchell/Howard/Floyd/Chickasaw/Worth, Page/Taylor, Keokuk/Mahaska/Lucas/Monroe/Wapello/Davis/Appanoose

Always together UNTIL 1981: NW 12; SW 7; SE 7; NE 4; Emmet, Palo Alto, Pocahontas, Calhoun; Jasper, Keokuk, Mahaska, Monroe, Wapello; Adams, Page, Taylor; Clarke, Decatur, Wayne; Winneshiek, Allamakee, Fayette, Clayton; Dallas, Madison, Greene, Carroll; Jackson, Clinton; Butler, Black Hawk; Iowa, Johnson; Hardin, Franklin.

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Page created 5/3/05; last updated ~~12/6/11~~ 9/6/22

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