Since Iowa became a U.S. state in 1846, it has sent congressional delegations to the United States Senate and United States House of Representatives. Each state elects two senators to serve for six years, and members of the House to two-year terms. Before becoming a state, the Iowa Territory elected a non-voting delegate at-large to Congress from 1838 to 1846.
These are tables of congressional delegations from Iowa to the United States Senate and the United States House of Representatives.
Current delegation
{| class="wikitable floatright" style="text-align: center;"
|-
! colspan=3 | Current U.S. senators from Iowa
|-
! rowspan=2 | <br/><br/>
{| class="wikitable"
! CPVI :
|-
|
|}
! Class II senator
! Class III senator
|- style="vertical-align: top;"
| x150px<br/>Joni Ernst<br/><br>
| x150px<br/>Chuck Grassley<br/><br>
|-
! Party
|
|
|-
! Incumbent since
| January 3, 2015
| January 3, 1981
|}
Iowa's current congressional delegation in the consists of its two senators and four representatives, all Republicans.
The current dean of the Iowa delegation is Senator and President pro tempore of the United States Senate Chuck Grassley, having served in the Senate since 1981 and in Congress since 1975.
United States Senate
{| class="wikitable sticky-header"
|- style="height:2em" align=center
! colspan="2" | Class II senator
!Congress
! colspan="2" | Class III senator
|- style="height:2em" align=center
| rowspan=6|George Wallace<br/>Jones (D)
| rowspan="3" style="background: #D3D3D3"|
|30th
|style="background: #D3D3D3"|
| rowspan=4|Augustus C. Dodge (D)
|- style="height:2em" align=center
|31st
| rowspan="3" |
|- style="height:2em" align=center
|32nd
|- style="height:2em" align=center
| rowspan="3" |
|33rd
|- style="height:2em" align=center
|34th
| rowspan="3" style="background: #D3D3D3"|
| rowspan=6|James Harlan (R)
|- style="height:2em" align=center
|35th
|- style="height:2em" align=center
| rowspan=7|James W. Grimes (R)
| rowspan="3" style="background: #D3D3D3"|
|36th
|- style="height:2em" align=center
|37th
| rowspan="4" |
|- style="height:2em" align=center
|38th
|- style="height:1.25em" align=center
| rowspan="5" |
|rowspan=2|39th
|- style="height:2em" align=center
||Samuel J. Kirkwood (R)
|- style="height:2em" align=center
|40th
| rowspan="4" style="background: #D3D3D3"|
| rowspan=4|James Harlan (R)
|- style="height:1.25em" align=center
|rowspan=2|41st
|- style="height:2em" align=center
||James B. Howell (R)
|- style="height:2em" align=center
| rowspan=3|George G. Wright (R)
| rowspan="3" style="background: #D3D3D3"|
|42nd
|- style="height:2em" align=center
|43rd
| rowspan="3" |
| rowspan=20|William B. Allison (R)
|- style="height:2em" align=center
|44th
|- style="height:2em" align=center
| rowspan=3|Samuel J. Kirkwood (R)
| rowspan="4" |
|45th
|- style="height:2em" align=center
|46th
| rowspan="4" style="background: #D3D3D3"|
|- style="height:1.25em" align=center
|rowspan=2|47th
|- style="height:2em" align=center
||James W. McDill (R)
|- style="height:2em" align=center
| rowspan=6|James F. Wilson (R)
| rowspan="3" style="background: #D3D3D3"|
|48th
|- style="height:2em" align=center
|49th
| rowspan="3" |
|- style="height:2em" align=center
|50th
|- style="height:2em" align=center
| rowspan="3" |
|51st
|- style="height:2em" align=center
|52nd
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
|53rd
|- style="height:2em" align=center
| rowspan=3|John H. Gear (R)
| rowspan="4" style="background: #D3D3D3"|
|54th
|- style="height:2em" align=center
|55th
| rowspan="4" |
|- style="height:1.25em" align=center
|rowspan=2|56th
|- style="height:1.25em" align=center
| rowspan=7|Jonathan P. Dolliver (R)
|- style="height:2em" align=center
| rowspan="3" |
|57th
|- style="height:2em" align=center
|58th
| rowspan="4" style="background: #D3D3D3"|
|- style="height:2em" align=center
|59th
|- style="height:1.25em" align=center
| rowspan="6" style="background: #D3D3D3"|
|rowspan=2|60th
|- style="height:1.25em" align=center
| rowspan=14|Albert B. Cummins (R)
|- style="height:1.25em" align=center
|rowspan=2|61st
| rowspan="5" |
|- style="height:1.25em" align=center
| rowspan=2|Lafayette Young (R)
|- style="height:1.25em" align=center
|rowspan=2|62nd
|- style="height:1.25em" align=center
| rowspan=6|William S. Kenyon (R)
|- style="height:2em" align=center
| rowspan="3" |
|63rd
|- style="height:2em" align=center
|64th
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
|65th
|- style="height:2em" align=center
| rowspan="5" style="background: #D3D3D3"|
|66th
|- style="height:1.25em" align=center
|rowspan=3|67th
| rowspan="6" |
|- style="height:2em" align=center
||Charles A. Rawson (R)
|- style="height:1.25em" align=center
| rowspan=3|Smith W. Brookhart (R)
|- style="height:2em" align=center
|68th
|- style="height:1.25em" align=center
| rowspan="4" |
|rowspan=2|69th
|- style="height:2em" align=center
| rowspan=3|Daniel F. Steck (D)
||David W. Stewart (R)
|- style="height:2em" align=center
|70th
| rowspan="3" style="background: #D3D3D3"|
| rowspan=3|Smith W. Brookhart (R)
|- style="height:2em" align=center
|71st
|- style="height:2em" align=center
| rowspan=4|L. J. Dickinson (R)
| rowspan="4" style="background: #D3D3D3"|
|72nd
|- style="height:2em" align=center
|73rd
| rowspan="4" |
| rowspan=2|Louis Murphy (D)
|- style="height:1.25em" align=center
|rowspan=2|74th
|- style="height:1.25em" align=center
| rowspan=5|Guy Gillette (D)
|- style="height:2em" align=center
| rowspan=3|Clyde L. Herring (D)
| rowspan="3" |
|75th
|- style="height:2em" align=center
|76th
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
|77th
|- style="height:2em" align=center
| rowspan=3|George A. Wilson (R)
| rowspan="3" style="background: #D3D3D3"|
|78th
|- style="height:2em" align=center
| 79th
| rowspan="3" |
| rowspan=12|Bourke B.<br/>Hickenlooper (R)
|- style="height:2em" align=center
| 80th
|- style="height:2em" align=center
| rowspan=3|Guy Gillette (D)
| rowspan="3" |
|81st
|- style="height:2em" align=center
|82nd
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
|83rd
|- style="height:2em" align=center
| rowspan=3|Thomas E. Martin (R)
| rowspan="3" style="background: #D3D3D3"|
|84th
|- style="height:2em" align=center
| 85th
| rowspan="3" |
|- style="height:2em" align=center
|86th
|- style="height:2em" align=center
| rowspan=6|Jack Miller (R)
| rowspan="3" |
|87th
|- style="height:2em" align=center
|88th
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
|89th
|- style="height:2em" align=center
| rowspan="3" style="background: #D3D3D3"|
|90th
|- style="height:2em" align=center
|91st
| rowspan="3" |
| rowspan=3|Harold Hughes (D)
|- style="height:2em" align=center
|92nd
|- style="height:2em" align=center
| rowspan=3|Dick Clark (D)
| rowspan="3" |
|93rd
|- style="height:2em" align=center
| 94th
| rowspan="3" style="background: #D3D3D3"|
| rowspan=3|John Culver (D)
|- style="height:2em" align=center
|95th
|- style="height:2em" align=center
| rowspan=3|Roger Jepsen (R)
| rowspan="3" style="background: #D3D3D3"|
|96th
|- style="height:2em" align=center
|97th
| rowspan="3" |
| rowspan=23|Chuck Grassley (R)
|- style="height:2em" align=center
|98th
|- style="height:2em" align=center
| rowspan=15|Tom Harkin (D)
| rowspan="3" |
| 99th
|- style="height:2em" align=center
| 100th
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
| 101st
|- style="height:2em" align=center
| rowspan="3" style="background: #D3D3D3"|
|102nd
|- style="height:2em" align=center
|103rd
| rowspan="3" |
|- style="height:2em" align=center
|104th
|- style="height:2em" align=center
| rowspan="3" |
|105th
|- style="height:2em" align=center
|106th
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
|107th
|- style="height:2em" align=center
| rowspan="3" style="background: #D3D3D3"|
|108th
|- style="height:2em" align=center
|109th
| rowspan="3" |
|- style="height:2em" align=center
|110th
|- style="height:2em" align=center
| rowspan="3" |
|111th
|- style="height:2em" align=center
|112th
| rowspan="3" style="background: #D3D3D3"|
|- style="height:2em" align=center
| 113th
|- style="height:2em" align=center
| rowspan=6|Joni Ernst (R)
| rowspan="3" style="background: #D3D3D3"|
| 114th
|- style="height:2em" align=center
| 115th
| rowspan="3" |
|- style="height:2em" align=center
| 116th
|- style="height:2em" align=center
| rowspan="3" |
| 117th
|- style="height:2em" align=center
| 118th
| rowspan="2" style="background: #D3D3D3"|
|- style="height:2em" align=center
| 119th
|}
United States House of Representatives
1838–1846: 1 non-voting delegate
On July 4, 1838, the Iowa Territory was organized. Most of the area comprising the territory was originally part of the Louisiana Purchase and was a part of the Missouri Territory. When Missouri became a state in 1821, this area (along with the Dakotas) effectively became unorganized territory. The area was closed to white settlers until the 1830s, after the Black Hawk War ended. It was attached to the Michigan Territory on June 28, 1834, and was split off with the Wisconsin Territory in 1836 when Michigan became a state. The Iowa Territory was the "Iowa District" of western Wisconsin Territory – the region west of the Mississippi River. The original boundaries of the territory, as established in 1838, included part of Minnesota and parts of the Dakotas, covering about of land.
Starting on September 10, 1838, Iowa Territory sent a non-voting delegate to the House.
{| class=wikitable
! Years
! Delegate from<br/>
|- style="height:2em"
| September 10, 1838 – October 27, 1840
| | William W. Chapman <small>(D)</small>
|- style="height:2em"
| October 28, 1840 – December 28, 1846
| | Augustus C. Dodge <small>(D)</small>
|}
1846–1863: 2 seats
Following statehood on December 28, 1846, Iowa had two seats in the House. It elected both seats statewide at-large on a general ticket, until 1847, when it redistricted into two districts.
{| class=wikitable style="text-align:center"
!rowspan=2 | Congress
!colspan=2 | Elected on a general ticket
|- style="height:2em"
!
!
|- style="height:2.5em"
|29th
| | Serranus C. Hastings <small>(D)</small>
| | Shepherd Leffler <small>(D)</small>
|- style="height:2.5em"
! Congress !! !!
|- style="height:2.5em"
|30th
| rowspan=2 | William Thompson <small>(D)</small>
| rowspan=3 | Shepherd Leffler <small>(D)</small>
|- style="height:1.5em"
| rowspan=2 | 31st
|- style="height:2em"
| | Daniel F. Miller <small>(W)</small>
|- style="height:2.5em"
|32nd
| rowspan=2 | Bernhart Henn <small>(D)</small>
| | Lincoln Clark <small>(D)</small>
|- style="height:2.5em"
|33rd
| | John Parsons Cook <small>(W)</small>
|- style="height:2.5em"
|34th
| | Augustus Hall <small>(D)</small>
| | James Thorington <small>(W)</small>
|- style="height:2.5em"
|35th
| rowspan=3 | Samuel Ryan Curtis <small>(R)</small>
| | Timothy Davis <small>(R)</small>
|- style="height:2.5em"
|36th
| rowspan=3 | William Vandever <small>(R)</small>
|- style="height:1.5em"
| rowspan=2 | 37th
|- style="height:2em"
| | James F. Wilson <small>(R)</small>
|}
1863–1873: 6 seats
Following the 1860 census, Iowa was apportioned 6 seats.
{| class=wikitable style="text-align:center"
|- style=height:2.5em
! Congress !! !! !! !! !! !!
|- style="height:2.5em"
|38th
| rowspan="3" | James F.<br/>Wilson <small>(R)</small>
| rowspan=3 | Hiram Price <small>(R)</small>
| rowspan=5 | William B. Allison <small>(R)</small>
| rowspan=2 | Josiah B.<br/>Grinnell <small>(R)</small>
| rowspan=2 | John A. Kasson <small>(R)</small>
| rowspan=3 | Asahel W.<br/>Hubbard <small>(R)</small>
|- style="height:2.5em"
|39th
|- style="height:2.5em"
|40th
| rowspan=3 | William<br/>Loughridge <small>(R)</small>
| | Grenville M. Dodge <small>(R)</small>
|- style="height:2em"
| rowspan=2 | 41st
| rowspan="3" | George W.<br/>McCrary <small>(R)</small>
| | William Smyth <small>(R)</small>
| rowspan=3 | Francis W. Palmer <small>(R)</small>
| rowspan=2 | Charles Pomeroy <small>(R)</small>
|- style="height:2em"
| | William P. Wolf <small>(R)</small>
|- style="height:2.5em"
|42nd
| | Aylett R. Cotton <small>(R)</small>
| | William G. Donnan <small>(R)</small>
| | Madison M. Walden <small>(R)</small>
| | Jackson Orr <small>(R)</small>
|}
1873–1883: 9 seats
Following the 1870 census, Iowa was apportioned 9 seats.
{| class=wikitable style="text-align:center"
|- style=height:2.5em
! Congress !! !! !! !! !! !! !! !! !!
|- style="height:2.5em"
|43rd
| rowspan="2" | George W.<br/>McCrary <small>(R)</small>
| | Aylett R. Cotton <small>(R)</small>
| | William G. Donnan <small>(R)</small>
| rowspan=2 | Henry Otis<br/>Pratt <small>(R)</small>
| rowspan=2 | James Wilson <small>(R)</small>
| | William Loughridge <small>(R)</small>
| rowspan=2 | John A. Kasson <small>(R)</small>
| rowspan=2 | James W.<br/>McDill <small>(R)</small>
| | Jackson Orr <small>(R)</small>
|- style="height:2.5em"
|44th
| | John Q. Tufts <small>(R)</small>
| | L. L. Ainsworth <small>(D)</small>
| rowspan=2 | Ezekiel S.<br/>Sampson <small>(R)</small>
| rowspan=2 | S. Addison<br/>Oliver <small>(R)</small>
|- style="height:2.5em"
|45th
| | Joseph Champlin<br/>Stone <small>(R)</small>
| rowspan=3 | Hiram Price <small>(R)</small>
| | Theodore Weld<br/>Burdick <small>(R)</small>
| rowspan=5 | Nathaniel Cobb<br/>Deering <small>(R)</small>
| rowspan=2 | Rush Clark <small>(R)</small>
| | Henry J. B.<br/>Cummings <small>(R)</small>
| rowspan=3 | William Fletcher<br/>Sapp <small>(R)</small>
|- style="height:1.25em"
| rowspan=2 | 46th
| rowspan="4" | Moses A.<br/>McCoid <small>(R)</small>
| rowspan=4 | Thomas<br/>Updegraff <small>(R)</small>
| rowspan=2 | James B. Weaver <small>(GB)</small>
| rowspan=2 | Edward H. Gillette <small>(GB)</small>
| rowspan=4 | Cyrus C.<br/>Carpenter <small>(R)</small>
|- style="height:1.25em"
| rowspan=3 | William George<br/>Thompson <small>(R)</small>
|- style="height:2em"
| rowspan=2 | 47th
| rowspan=2 | Sewall S. Farwell <small>(R)</small>
| | Marsena E. Cutts <small>(R)</small>
| rowspan=2 | John A. Kasson <small>(R)</small>
| rowspan=2 | William P.<br/>Hepburn <small>(R)</small>
|- style="height:2em"
| | John C. Cook <small>(D)</small>
|}
1883–1933: 11 seats
Following the 1880 census, Iowa was apportioned 11 seats.
{| class="wikitable sticky-header-multi sortable" style="text-align:center"
! rowspan=2 class=unsortable | Congress
! colspan=11 | District
|-
! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable | !! class=unsortable |
|- style="height:2em"
| rowspan=2 | 48th
| rowspan=2 | Moses A.<br/>McCoid <small>(R)</small>
| rowspan=3 | Jeremiah<br/>H.<br/>Murphy <small>(D)</small>
| rowspan=13 | David B.<br/>Henderson<br/><small>(R)</small>
| rowspan=2 | Luman Hamlin<br/>Weller <small>(GB)</small>
| | Jim Wilson <small>(R)</small>
| | Marsena E.<br/>Cutts <small>(R)</small>
| | John A.<br/>Kasson <small>(R)</small>
| rowspan=3 | William P.<br />Hepburn <small>(R)</small>
| rowspan=2 | William H. M.<br/>Pusey <small>(D)</small>
| rowspan=4 | Adoniram J.<br/>Holmes <small>(R)</small>
| rowspan=6 | Isaac S.<br/>Struble <small>(R)</small>
|- style="height:2em"
| rowspan=2 | Benjamin T.<br/>Frederick <small>(D)</small>
| | John Cook <small>(D)</small>
| | Hiram Smith <small>(R)</small>
|- style="height:2.5em"
|49th
| | Ben Hall <small>(D)</small>
| rowspan=2 | William E.<br/>Fuller <small>(R)</small>
| rowspan=2 | James B.<br/>Weaver <small>(GB)</small>
| rowspan=3 | Edwin H.<br/>Conger <small>(R)</small>
| rowspan=2 | Joseph<br/>Lyman <small>(R)</small>
|- style="height:2.5em"
|50th
| rowspan=3 | John H.<br/>Gear <small>(R)</small>
| rowspan=5 | Walter I.<br/>Hayes <small>(D)</small>
| rowspan=3 | Daniel Kerr <small>(R)</small>
| | Albert R.<br/>Anderson <small>(IR)</small>
|- style="height:1.25em"
| rowspan=2 | 51st
| rowspan=2 | Joseph Henry<br/>Sweney <small>(R)</small>
| rowspan=2 | John F.<br/>Lacey <small>(R)</small>
| rowspan=3 | James P.<br/>Flick <small>(R)</small>
| rowspan=2 | Joseph Rea<br/>Reed <small>(R)</small>
| rowspan=7 | Jonathan P.<br/>Dolliver <small>(R)</small>
|- style="height:2em"
| | Edward Hays <small>(R)</small>
|- style="height:2.5em"
|52nd
| | John J.<br/>Seerley <small>(D)</small>
| | Walter H.<br/>Butler <small>(D)</small>
| | John Taylor<br/>Hamilton <small>(D)</small>
| | Frederick E.<br/>White <small>(D)</small>
| rowspan=11 | John A. T.<br/>Hull <small>(R)</small>
| | Thomas<br/>Bowman <small>(D)</small>
| rowspan=4 | George D.<br/>Perkins <small>(R)</small>
|- style="height:2.5em"
|53rd
| | John Gear <small>(R)</small>
| rowspan=3 | Thomas<br/>Updegraff <small>(R)</small>
| rowspan=9 | Robert G.<br/>Cousins <small>(R)</small>
| rowspan=8 | John F.<br/>Lacey <small>(R)</small>
| rowspan=9 | William P.<br/>Hepburn <small>(R)</small>
| rowspan=3 | Alva L.<br/>Hager <small>(R)</small>
|- style="height:2.5em"
|54th
| rowspan=2 | Samuel M.<br/>Clark <small>(R)</small>
| rowspan=2 | George M.<br/>Curtis <small>(R)</small>
|- style="height:2.5em"
|55th
|- style="height:2em"
| rowspan=2 | 56th
| rowspan=5 | Thomas<br/>Hedge <small>(R)</small>
| rowspan=2 | Joe Lane <small>(R)</small>
| rowspan=23 | Gilbert N.<br/>Haugen <small>(R)</small>
| | Smith<br/>McPherson <small>(R)</small>
| rowspan=4 | Lot<br/>Thomas <small>(R)</small>
|- style="height:1.25em"
| rowspan=7 | Walter I.<br/>Smith <small>(R)</small>
| rowspan=5 | James P.<br/>Conner <small>(R)</small>
|- style="height:2.5em"
|57th
| | John Rumple <small>(R)</small>
|- style="height:2.5em"
|58th
| | Martin Wade <small>(D)</small>
| rowspan=3 | Benjamin P.<br/>Birdsall <small>(R)</small>
|- style="height:2.5em"
|59th
| rowspan=3 | Albert F.<br/>Dawson <small>(R)</small>
| rowspan=4 | Elbert H.<br/>Hubbard <small>(R)</small>
|- style="height:2.5em"
|60th
| rowspan=9 | Charles A.<br/>Kennedy <small>(R)</small>
| | Daniel W.<br/>Hamilton <small>(D)</small>
|- style="height:2.5em"
|61st
| rowspan=3 | Charles E.<br/>Pickett <small>(R)</small>
| rowspan=9 | James W.<br/>Good <small>(R)</small>
| rowspan=3 | Nathan E.<br/>Kendall <small>(R)</small>
| | William Darius<br/>Jamieson <small>(D)</small>
| rowspan=7 | Frank P.<br/>Woods <small>(R)</small>
|- style="height:1.25em"
| rowspan=2 | 62nd
| rowspan=3 | Irvin S.<br/>Pepper <small>(D)</small>
| rowspan=4 | Solomon F.<br/>Prouty <small>(R)</small>
| rowspan=10 | Horace M.<br/>Towner <small>(R)</small>
|- style="height:1.25em"
| rowspan=12 | William R.<br/>Green <small>(R)</small>
| rowspan=3 | George C.<br/>Scott <small>(R)</small>
|- style="height:1.25em"
| rowspan=2 | 63rd
| rowspan=2 | Maurice<br/>Connolly <small>(D)</small>
| rowspan=2 | Sanford<br/>Kirkpatrick <small>(D)</small>
|- style="height:2em"
| | Henry Vollmer <small>(D)</small>
|- style="height:2.5em"
|64th
| rowspan=7 | Harry E.<br/>Hull <small>(R)</small>
| rowspan=5 | Burton E.<br/>Sweet <small>(R)</small>
| rowspan=12 | C. William<br/>Ramseyer <small>(R)</small>
| rowspan=12 | Cassius C.<br/>Dowell <small>(R)</small>
| | Thomas J.<br/>Steele <small>(D)</small>
|- style="height:2.5em"
|65th
| | George C.<br/>Scott <small>(R)</small>
|- style="height:2.5em"
|66th
| rowspan=9 | L. J.<br/>Dickinson <small>(R)</small>
| rowspan=8 | William D.<br/>Boies <small>(R)</small>
|- style="height:1.25em"
| rowspan=2 | 67th
| rowspan=9 | William F.<br/>Kopp <small>(R)</small>
|- style="height:1.25em"
| rowspan=8 | Cyrenus<br/>Cole <small>(R)</small>
|- style="height:1.25em"
| rowspan=2 | 68th
| rowspan=7 | Thomas J. B.<br/>Robinson <small>(R)</small>
|- style="height:2em"
| | Hiram Evans <small>(R)</small>
|- style="height:2.5em"
|69th
| rowspan=4 | F. Dickinson<br/>Letts <small>(R)</small>
| rowspan=5 | Lloyd<br/>Thurston <small>(R)</small>
|- style="height:1.25em"
| rowspan=2 | 70th
|- style="height:2em"
| | Earl Vincent <small>(R)</small>
|- style="height:2.5em"
|71st
| rowspan=2 | Charles E.<br/>Swanson <small>(R)</small>
| rowspan=2 | Ed H.<br/>Campbell <small>(R)</small>
|- style="height:2.5em"
|72nd
| | Bernhard M.<br/>Jacobsen <small>(D)</small>
| | Fred C.<br/>Gilchrist <small>(R)</small>
|}
1933–1943: 9 seats
Following the 1930 census, Iowa was apportioned 9 seats.
{| class=wikitable style="text-align:center"
! rowspan=2 | Congress
! colspan=9 | District
|- style=height:2em
! !! !! !! !! !! !! !! !!
|- style="height:2.5em"
|73rd
| rowspan=3 | Edward C.<br/>Eicher <small>(D)</small>
| rowspan="2" | Bernhard M.<br/>Jacobsen <small>(D)</small>
| | Albert Willford <small>(D)</small>
| rowspan=3 | Fred<br/>Biermann <small>(D)</small>
| rowspan=3 | Lloyd<br/>Thurston <small>(R)</small>
| | Cassius C. Dowell <small>(R)</small>
| rowspan=3 | Otha<br/>Wearin <small>(D)</small>
| rowspan=6 | Fred C.<br/>Gilchrist <small>(R)</small>
| rowspan=2 | Guy Gillette <small>(D)</small>
|- style="height:2.5em"
|74th
| rowspan="5" | John W.<br/>Gwynne <small>(R)</small>
| | Hubert Utterback <small>(D)</small>
|- style="height:2.5em"
|75th
| rowspan=4 | William S.<br/>Jacobsen <small>(D)</small>
| rowspan=2 | Cassius C. Dowell <small>(R)</small>
| rowspan=3 | Vincent F.<br/>Harrington <small>(D)</small>
|- style="height:2.5em"
|76th
| rowspan="3" | Thomas E.<br/>Martin <small>(R)</small>
| rowspan=3 | Henry O.<br/>Talle <small>(R)</small>
| rowspan=3 | Karl M.<br/>LeCompte <small>(R)</small>
| rowspan="3" | Ben F.<br/>Jensen <small>(R)</small>
|- style="height:1.5em"
| rowspan=2 | 77th
| rowspan=2 | Paul<br/>Cunningham <small>(R)</small>
|- style="height:2em"
| | Harry Narey <small>(R)</small>
|}
1943–1963: 8 seats
Following the 1940 census, Iowa was apportioned 8 seats.
{| class=wikitable style="text-align:center"
! rowspan=2 | Congress
! colspan=8 | District
|- style=height:2em
! !! !! !! !! !! !! !!
|- style="height:2.5em"
|78th
| rowspan="6" | Thomas E.<br/>Martin <small>(R)</small>
| rowspan=8 | Henry O.<br/>Talle <small>(R)</small>
| rowspan="3" | John W.<br/>Gwynne <small>(R)</small>
| rowspan=8 | Karl M.<br/>LeCompte <small>(R)</small>
| rowspan=8 | Paul<br/>Cunningham<br/><small>(R)</small>
| | Fred C.<br/>Gilchrist <small>(R)</small>
| rowspan="10" | Ben F.<br/>Jensen <small>(R)</small>
| rowspan=10 | Charles B.<br/>Hoeven <small>(R)</small>
|- style="height:2.5em"
|79th
| rowspan=6 | James I.<br/>Dolliver <small>(R)</small>
|- style="height:2.5em"
|80th
|- style="height:2.5em"
|81st
| rowspan="7" | H. R.<br/>Gross <small>(R)</small>
|- style="height:2.5em"
|82nd
|- style="height:2.5em"
|83rd
|- style="height:2.5em"
|84th
| rowspan=4 | Fred<br/>Schwengel <small>(R)</small>
|- style="height:2.5em"
|85th
| rowspan=3 | Merwin<br/>Coad <small>(D)</small>
|- style="height:2.5em"
|86th
| | Leonard G.<br/>Wolf <small>(D)</small>
| | Steven V.<br/>Carter <small>(D)</small>
| rowspan=2 | Neal<br/>Smith <small>(D)</small>
|- style="height:2.5em"
|87th
| | James E.<br/>Bromwell <small>(R)</small>
| | John Henry<br/>Kyl <small>(R)</small>
|}
1963–1973: 7 seats
Following the 1960 census, Iowa was apportioned 7 seats.
{| class=wikitable style="text-align:center"
! rowspan=2 | Congress
! colspan=7 | District
|- style=height:2em
! !! !! !! !! !! !!
|- style="height:2.5em"
|88th
| | Fred<br/>Schwengel <small>(R)</small>
| | James E.<br/>Bromwell <small>(R)</small>
| rowspan=5 | H. R.<br/>Gross <small>(R)</small>
| | John Henry<br/>Kyl <small>(R)</small>
| rowspan=5 | Neal<br/>Smith <small>(D)</small>
| | Charles B.<br/>Hoeven <small>(R)</small>
| | Ben F.<br/>Jensen <small>(R)</small>
|- style="height:2.5em"
|89th
| | John R.<br/>Schmidhauser <small>(D)</small>
| rowspan="4" | John<br/>Culver <small>(D)</small>
| | Bert<br/>Bandstra <small>(D)</small>
| | Stanley L.<br/>Greigg <small>(D)</small>
| | John R.<br/>Hansen <small>(D)</small>
|- style="height:2.5em"
|90th
| rowspan=3 | Fred<br/>Schwengel <small>(R)</small>
| rowspan=3 | John Henry<br/>Kyl <small>(R)</small>
| rowspan="3" | Wiley<br/>Mayne <small>(R)</small>
| rowspan=3 | William J.<br/>Scherle <small>(R)</small>
|- style="height:2.5em"
|91st
|- style="height:2.5em"
|92nd
|}
1973–1993: 6 seats
Following the 1970 census, Iowa was apportioned 6 seats.
{| class=wikitable style="text-align:center"
|- style=height:2.5em
! Congress !! !! !! !! !! !!
|- style="height:2.5em"
|93rd
| rowspan=2 | Edward<br/>Mezvinsky <small>(D)</small>
| | John Culver <small>(D)</small>
| | H. R. Gross <small>(R)</small>
| rowspan="10" | Neal<br />Smith <small>(D)</small>
| | William Scherle <small>(R)</small>
| | Wiley Mayne <small>(R)</small>
|- style="height:2.5em"
|94th
| rowspan=2 | Mike Blouin <small>(D)</small>
| rowspan=3 | Chuck<br/>Grassley <small>(R)</small>
| rowspan=5 | Tom Harkin <small>(D)</small>
| rowspan=6 | Berkley<br/>Bedell <small>(D)</small>
|- style="height:2.5em"
|95th
| rowspan="8" | Jim Leach <small>(R)</small>
|- style="height:2.5em"
|96th
| rowspan=6 | Tom Tauke <small>(R)</small>
|- style="height:2em"
|97th
| rowspan=3 | T. Cooper<br/>Evans <small>(R)</small>
|- style="height:2.5em"
|98th
|- style="height:2.5em"
|99th
| rowspan=4 | Jim Ross<br/>Lightfoot <small>(R)</small>
|- style="height:2.5em"
|100th
| rowspan=3 | Dave<br/>Nagle <small>(D)</small>
| rowspan=3 | Fred Grandy <small>(R)</small>
|- style="height:2.5em"
|101st
|- style="height:2.5em"
|102nd
| | Jim Nussle <small>(R)</small>
|}
1993–2013: 5 seats
Following the 1990 census, Iowa was apportioned 5 seats.
{| class=wikitable style="text-align:center"
|- style=height:2.5em
! Congress !! !! !! !! !!
|- style="height:2.5em"
|103rd
| rowspan="5" | Jim Leach <small>(R)</small>
| rowspan="5" | Jim Nussle <small>(R)</small>
| rowspan=2 | Jim Ross<br/>Lightfoot <small>(R)</small>
| | Neal Smith <small>(D)</small>
| | Fred Grandy <small>(R)</small>
|- style="height:2.5em"
|104th
| rowspan=4 | Greg Ganske <small>(R)</small>
| rowspan=4 | Tom Latham <small>(R)</small>
|- style="height:2.5em"
|105th
| rowspan=8 | Leonard<br/>Boswell <small>(D)</small>
|- style="height:2.5em"
|106th
|- style="height:2.5em"
|107th
|- style="height:2.5em"
|108th
| rowspan=2 | Jim Nussle <small>(R)</small>
| rowspan=2 | Jim Leach <small>(R)</small>
| rowspan=5 | Tom Latham <small>(R)</small>
| rowspan=5 | Steve King <small>(R)</small>
|- style="height:2.5em"
|109th
|- style="height:2.5em"
|110th
| rowspan="3" | Bruce Braley <small>(D)</small>
| rowspan="3" | Dave<br/>Loebsack <small>(D)</small>
|- style="height:2.5em"
|111th
|- style="height:2.5em"
|112th
|}
2013–present: 4 seats
Following the 2010 census, Iowa was apportioned 4 seats.
{| class=wikitable style="text-align:center"
|- style=height:2.5em
! Congress !! !! !! !!
|- style="height:2.5em"
|113th
| | Bruce Braley <small>(D)</small>
| rowspan="4" | Dave<br/>Loebsack <small>(D)</small>
| rowspan=1 | Tom Latham <small>(R)</small>
| rowspan=4 | Steve King <small>(R)</small>
|- style="height:2.5em"
|114th
| rowspan=2 | Rod Blum <small>(R)</small>
| rowspan=2 | David Young <small>(R)</small>
|- style="height:2.5em"
|115th
|- style="height:2.5em"
|116th
|| Abby Finkenauer <small>(D)</small>
| rowspan=2 | Cindy Axne <small>(D)</small>
|- style="height:2.5em"
|117th
| | Ashley Hinson <small>(R)</small>
| | Mariannette<br/>Miller-Meeks <small>(R)</small>
| rowspan=3 | Randy Feenstra <small>(R)</small>
|- style="height:2.5em"
|118th
| rowspan=2 | Mariannette<br/>Miller-Meeks <small>(R)</small>
| rowspan=2 | Ashley Hinson <small>(R)</small>
| rowspan=2 | Zach Nunn <small>(R)</small>
|- style="height:2.5em"
| (2025–2027)
|}
Key
See also
- List of United States congressional districts
- Iowa's congressional districts
- Political party strength in Iowa