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 U.S. senators from Iowa|
|Class II senator||Class III senator|
|Incumbent since||January 3, 2015||January 3, 1981|
Iowa's current congressional delegation in the 118th Congress consists of its two senators and four representatives, all Republicans.
The current dean of the Iowa delegation is Senator and President pro tempore emeritus of the United States Senate Chuck Grassley, having served in the Senate since 1981 and in Congress since 1975.
|Current U.S. representatives from Iowa|
|Republican||January 3, 2021||R+3|
|Republican||January 3, 2021||R+4|
|Republican||January 3, 2023||R+3|
|Republican||January 3, 2021||R+16|
Main article: List of United States senators from Iowa
|Class II senator||Congress||Class III senator|
|30th (1847–1849)||Augustus C. Dodge (D)|
|34th (1855–1857)||James Harlan (R)|
|James W. Grimes (R)||36th (1859–1861)|
|Samuel J. Kirkwood (R)|
|40th (1867–1869)||James Harlan (R)|
|James B. Howell (R)|
|George G. Wright (R)||42nd (1871–1873)|
|43rd (1873–1875)||William B. Allison (R)|
|Samuel J. Kirkwood (R)||45th (1877–1879)|
|James W. McDill (R)|
|James F. Wilson (R)||48th (1883–1885)|
|John H. Gear (R)||54th (1895–1897)|
|Jonathan P. Dolliver (R)|
|Albert B. Cummins (R)|
|Lafayette Young (R)|
|William S. Kenyon (R)|
|Charles A. Rawson (R)|
|Smith W. Brookhart (R)|
|Daniel F. Steck (D)||David W. Stewart (R)|
|70th (1927–1929)||Smith W. Brookhart (R)|
|L. J. Dickinson (R)||72nd (1931–1933)|
|73rd (1933–1935)||Louis Murphy (D)|
|Guy Gillette (D)|
|Clyde L. Herring (D)||75th (1937–1939)|
|George A. Wilson (R)||78th (1943–1945)|
|79th (1945–1947)||Bourke B.|
|Guy Gillette (D)||81st (1949–1951)|
|Thomas E. Martin (R)||84th (1955–1957)|
|Jack Miller (R)||87th (1961–1963)|
|91st (1969–1971)||Harold Hughes (D)|
|Dick Clark (D)||93rd (1973–1975)|
|94th (1975–1977)||John Culver (D)|
|Roger Jepsen (R)||96th (1979–1981)|
|97th (1981–1983)||Chuck Grassley (R)|
|Tom Harkin (D)||99th (1985–1987)|
|Joni Ernst (R)||114th (2015–2017)|
Main article: List of United States representatives from Iowa
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 194,000 square miles (500,000 km2) of land.
Starting on September 10, 1838, Iowa Territory sent a non-voting delegate to the House.
Territory's at-large district
|September 10, 1838 – October 27, 1840||William W. Chapman (D)|
|October 28, 1840 – December 28, 1846||Augustus C. Dodge (D)|
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.
|Congress||Elected on a general ticket|
from Iowa's at-large district
|1st seat||2nd seat|
|29th (1845–1847)||Serranus C. Hastings (D)||Shepherd Leffler (D)|
|30th (1847–1849)||William Thompson (D)||Shepherd Leffler (D)|
|Daniel F. Miller (W)|
|32nd (1851–1853)||Bernhart Henn (D)||Lincoln Clark (D)|
|33rd (1853–1855)||John Parsons Cook (W)|
|34th (1855–1857)||Augustus Hall (D)||James Thorington (W)|
|35th (1857–1859)||Samuel Ryan Curtis (R)||Timothy Davis (R)|
|36th (1859–1861)||William Vandever (R)|
|James F. Wilson (R)|
Following the 1860 census, Iowa was apportioned 6 seats.
|38th (1863–1865)||James F.
|Hiram Price (R)||William B. Allison (R)||Josiah Bushnell
|John A. Kasson (R)||Asahel W.|
|Grenville M. Dodge (R)|
|41st (1869–1871)||George W.
|William Smyth (R)||Francis W. Palmer (R)||Charles Pomeroy (R)|
|William P. Wolf (R)|
|42nd (1871–1873)||Aylett R. Cotton (R)||William G. Donnan (R)||Madison M. Walden (R)||Jackson Orr (R)|
Following the 1870 census, Iowa was apportioned 9 seats.
|43rd (1873–1875)||George W.
|Aylett R. Cotton (R)||William G. Donnan (R)||Henry Otis
|James Wilson (R)||William Loughridge (R)||John A. Kasson (R)||James W.
|Jackson Orr (R)|
|44th (1875–1877)||John Q. Tufts (R)||L. L. Ainsworth (D)||Ezekiel S.
|45th (1877–1879)||Joseph Champlin
|Hiram Price (R)||Theodore Weld
|Rush Clark (R)||Henry J. B.
|46th (1879–1881)||Moses A.
|James B. Weaver (GB)||Edward H. Gillette (GB)||Cyrus C.|
|47th (1881–1883)||Sewall S. Farwell (R)||Marsena E. Cutts (R)||John A. Kasson (R)||William Peters|
|John C. Cook (D)|
Following the 1880 census, Iowa was apportioned 11 seats.
|48th (1883–1885)||Moses A.
|Jim Wilson (R)||Marsena E.
Mills Pusey (D)
|John Cook (D)||Hiram Smith (R)|
|49th (1885–1887)||Ben Hall (D)||William E.
|50th (1887–1889)||John H.
|Daniel Kerr (R)||Albert R.|
|51st (1889–1891)||Joseph Henry
|Edward Hays (R)|
|52nd (1891–1893)||John Joseph
|John A. T.
|53rd (1893–1895)||John Gear (R)||Thomas
|54th (1895–1897)||Samuel M.
|Joe Lane (R)||Gilbert N.
|57th (1901–1903)||John Rumple (R)|
|58th (1903–1905)||Martin Wade (D)||Benjamin P.|
|59th (1905–1907)||Albert F.
|60th (1907–1909)||Charles A.
|61st (1909–1911)||Charles E.
|62nd (1911–1913)||Irvin S.
|Henry Vollmer (D)|
|64th (1915–1917)||Harry E.
|65th (1917–1919)||George C.|
|66th (1919–1921)||L. J.
|67th (1921–1923)||William F.|
|68th (1923–1925)||Thomas J. B.|
|Hiram Evans (R)|
|69th (1925–1927)||F. Dickinson
|Earl Vincent (R)|
|72nd (1931–1933)||Bernhard M.
Following the 1930 census, Iowa was apportioned 9 seats.
|73rd (1933–1935)||Edward C.
|Albert Willford (D)||Fred
|Cassius C. Dowell (R)||Otha
|Guy Gillette (D)|
|74th (1935–1937)||John W.
|Hubert Utterback (D)|
|75th (1937–1939)||William S.
|Cassius C. Dowell (R)||Vincent F.|
|76th (1939–1941)||Thomas E.
|Harry Narey (R)|
Following the 1940 census, Iowa was apportioned 8 seats.
|78th (1943–1945)||Thomas E.
|79th (1945–1947)||James I.|
|81st (1949–1951)||H. R.|
|86th (1959–1961)||Leonard G.
|87th (1961–1963)||James E.
Following the 1960 census, Iowa was apportioned 7 seats.
|89th (1965–1967)||John R.
Following the 1970 census, Iowa was apportioned 6 seats.
|John Culver (D)||H. R. Gross (R)||Neal
|William Scherle (R)||Wiley Mayne (R)|
|94th (1975–1977)||Mike Blouin (D)||Chuck
|Tom Harkin (D)||Berkley|
|95th (1977–1979)||Jim Leach (R)|
|96th (1979–1981)||Tom Tauke (R)|
|97th (1981–1983)||T. Cooper|
|99th (1985–1987)||Jim Ross|
|Fred Grandy (R)|
|102nd (1991–1993)||Jim Nussle (R)|
Following the 1990 census, Iowa was apportioned 5 seats.
|103rd (1993–1995)||Jim Leach (R)||Jim Nussle (R)||Jim Ross
|Neal Smith (D)||Fred Grandy (R)|
|104th (1995–1997)||Greg Ganske (R)||Tom Latham (R)|
|108th (2003–2005)||Jim Nussle (R)||Jim Leach (R)||Tom Latham (R)||Steve King (R)|
|110th (2007–2009)||Bruce Braley (D)||Dave|
Following the 2010 census, Iowa was apportioned 4 seats.
|113th (2013–2015)||Bruce Braley (D)||Dave
|Tom Latham (R)||Steve King (R)|
|114th (2015–2017)||Rod Blum (R)||David Young (R)|
|116th (2019–2021)||Abby Finkenauer (D)||Cindy Axne (D)|
|117th (2021–2023)||Ashley Hinson (R)||Mariannette
|Randy Feenstra (R)|
|Ashley Hinson (R)||Zach Nunn (R)|