List of United States senators from Iowa

Iowa was admitted to the Union on December 28, 1846, and elects United States senators to class 2 and class 3. The state's current U.S. senators are Republicans Chuck Grassley (serving since 1981) and Joni Ernst (serving since 2015). Chuck Grassley is Iowa's longest-serving senator (since 1981).

List of senators

 * - style="height:2em"
 * rowspan=2 colspan=3 | Vacant
 * rowspan=2 nowrap | Dec 28, 1846 – Dec 7, 1848
 * rowspan=2 | Legislature failed to elect.
 * rowspan=2 | —
 * rowspan=2 | —
 * rowspan=2 | Legislature failed to elect.
 * rowspan=2 nowrap | Dec 28, 1846 – Dec 7, 1848
 * rowspan=2 colspan=3 | Vacant
 * rowspan=2 colspan=3 | Vacant


 * - style="height:2em"
 * rowspan=2

! rowspan=9 | 1 ! rowspan=4 | 1
 * - style="height:2em"
 * rowspan=9 align=left | George Wallace Jones, US Senator.jpg George W. Jones
 * rowspan=9 | Democratic
 * rowspan=9 nowrap | Dec 7, 1848 – Mar 3, 1859
 * rowspan=3 | Elected in 1848.
 * rowspan=3 | 1
 * 1
 * Elected in 1848.
 * rowspan=4 nowrap | Dec 7, 1848 – Feb 22, 1855
 * rowspan=4 | Democratic
 * rowspan=4 align=right | Augustus Caesar Dodge.jpg Augustus C. Dodge


 * - style="height:2em"
 * rowspan=4 | 2
 * rowspan=3 | Re-elected in 1849.Resigned to become U.S. Minister to Spain, having lost re-election.
 * rowspan=3 | Re-elected in 1849.Resigned to become U.S. Minister to Spain, having lost re-election.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=6 | Re-elected in 1852.Lost renomination.
 * rowspan=6 | 2
 * rowspan=2


 * - style="height:2em"
 * nowrap | Feb 22, 1855 – Mar 3, 1855
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=8 | 2
 * - style="height:2em"
 * rowspan=3
 * rowspan=5 | 3
 * Elected in 1855.Elected invalidated, as the Iowa Senate had not participated in it.
 * nowrap | Mar 4, 1855 – Jan 5, 1857
 * | Free Soil
 * align=right | James-Harlan.jpg James Harlan


 * - style="height:2em"
 * nowrap | Jan 5, 1857 – Jan 29, 1857
 * colspan=2 | Vacant
 * colspan=2 | Vacant


 * - style="height:2em"
 * rowspan=3 | Re-elected to finish his vacant term.
 * rowspan=6 nowrap | Jan 29, 1857 – May 15, 1865
 * rowspan=6 | Republican
 * rowspan=6 align=right | James-Harlan.jpg James Harlan


 * - style="height:2em"

! rowspan=8 | 2
 * - style="height:2em"
 * rowspan=8 align=left | Hon. James W. Grimes, Iowa - NARA - 528410.jpg James W. Grimes
 * rowspan=8 | Republican
 * rowspan=8 nowrap | Mar 4, 1859 – Dec 6, 1869
 * rowspan=3 | Elected in 1858.
 * rowspan=3 | 3


 * - style="height:2em"
 * rowspan=5 | 4
 * rowspan=3 |Re-elected in 1860.Resigned to become U.S. Secretary of the Interior.
 * rowspan=3 |Re-elected in 1860.Resigned to become U.S. Secretary of the Interior.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=5 | Re-elected in 1864.Resigned due to ill health.
 * rowspan=7 | 4
 * rowspan=3


 * - style="height:2em"
 * nowrap | May 15, 1865 – Jan 13, 1866
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! 3
 * - style="height:2em"
 * Elected to finish Harlan's term. Lost nomination for the next term.
 * nowrap | Jan 13, 1866 – Mar 3, 1867
 * | Republican
 * align=right | Samuel Jordan Kirkwood.jpg Samuel J. Kirkwood

! rowspan=5 | 4
 * - style="height:2em"
 * rowspan=5 | 5
 * rowspan=5 | Elected in 1866. Lost re-election.
 * rowspan=5 nowrap | Mar 4, 1867 – Mar 3, 1873
 * rowspan=5 | Republican
 * rowspan=5 align=right | James-Harlan.jpg James Harlan
 * rowspan=5 align=right | James-Harlan.jpg James Harlan


 * - style="height:2em"
 * rowspan=3


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Dec 6, 1869 – Jan 18, 1870

! 3
 * - style="height:2em"
 * align=left | James B. Howell - History of Iowa.jpg James B. Howell
 * | Republican
 * nowrap | Jan 18, 1870 – Mar 3, 1871
 * Elected to finish Grimes's term.Retired.

! rowspan=3 | 4
 * - style="height:2em"
 * rowspan=3 align=left | George Grover Wright.jpg George G. Wright
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1871 – Mar 3, 1877
 * rowspan=3 | Elected in 1870.Retired.
 * rowspan=3 | 5

! rowspan=21 | 5
 * - style="height:2em"
 * rowspan=3 | 6
 * rowspan=3 | Elected in 1872.
 * rowspan=21 nowrap | Mar 4, 1873 – Aug 4, 1908
 * rowspan=21 | Republican
 * rowspan=21 align=right | William B. Allison - Brady-Handy.jpg William B. Allison
 * rowspan=21 align=right | William B. Allison - Brady-Handy.jpg William B. Allison


 * - style="height:2em"

! rowspan=3 | 5
 * - style="height:2em"
 * rowspan=3 align=left | Samuel Jordan Kirkwood.jpg Samuel J. Kirkwood
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1877 – Mar 7, 1881
 * rowspan=3 | Elected in 1876 or 1877.Resigned to become U.S. Secretary of the Interior.
 * rowspan=4 | 6


 * - style="height:2em"
 * rowspan=4 | 7
 * rowspan=4 | Re-elected in 1878.
 * rowspan=4 | Re-elected in 1878.


 * - style="height:2em"
 * rowspan=2

! 6
 * - style="height:2em"
 * align=left | James W. McDill - Brady-Handy.jpg James W. McDill
 * | Republican
 * nowrap | Mar 8, 1881 – Mar 3, 1883
 * Appointed to continue Kirkwood's term.Elected in 1882 to finish Kirkwood's term. Retired.

! rowspan=6 | 7
 * - style="height:2em"
 * rowspan=6 align=left | James Falconer Wilson - Brady-Handy.jpg James F. Wilson
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Mar 4, 1883 – Mar 3, 1895
 * rowspan=3 | Elected in 1882.
 * rowspan=3 | 7


 * - style="height:2em"
 * rowspan=3 | 8
 * rowspan=3 | Re-elected in 1884.
 * rowspan=3 | Re-elected in 1884.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1888.Retired.
 * rowspan=3 | 8


 * - style="height:2em"
 * rowspan=3 | 9
 * rowspan=3 | Re-elected in 1890.
 * rowspan=3 | Re-elected in 1890.


 * - style="height:2em"

! rowspan=3 | 8
 * - style="height:2em"
 * rowspan=3 align=left | John Henry Gear - Senator.jpg John H. Gear
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1895 – Jul 14, 1900
 * rowspan=3 | Elected in 1894. Re-elected in 1900, but died.
 * rowspan=5 | 9


 * - style="height:2em"
 * rowspan=5 | 10
 * rowspan=5 | Re-elected in 1896.
 * rowspan=5 | Re-elected in 1896.


 * - style="height:2em"
 * rowspan=3


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Jul 14, 1900 – Aug 22, 1900

! rowspan=8 | 9
 * - style="height:2em"
 * rowspan=8 align=left | Jonathan P. Dolliver - History of Iowa.jpg Jonathan P. Dolliver
 * rowspan=8 | Republican
 * rowspan=8 nowrap | Aug 22, 1900 – Oct 15, 1910
 * Appointed to finish Gear's term.


 * - style="height:2em"
 * rowspan=3 | Appointed to begin the vacant term.Elected in 1902 to finish the vacant term.
 * rowspan=3 | 10


 * - style="height:2em"
 * rowspan=5 | 11
 * rowspan=3 | Re-elected in 1902. Renominated in 1908 but died before the general election.
 * rowspan=3 | Re-elected in 1902. Renominated in 1908 but died before the general election.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=4 | Re-elected in 1907.Died.
 * rowspan=8 | 11
 * rowspan=3


 * - style="height:2em"
 * nowrap | Aug 4, 1908 – Nov 24, 1908
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=16 | 6
 * - style="height:2em"
 * Elected to finish Allison's term.
 * rowspan=16 nowrap | Nov 24, 1908 – Jul 30, 1926
 * rowspan=16 | Republican
 * rowspan=16 align=right | Albert B Cummins.jpg Albert B. Cummins


 * - style="height:2em"
 * rowspan=3
 * rowspan=6 | 12
 * rowspan=6 | Re-elected in 1909.


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Oct 15, 1910 – Nov 12, 1910

! rowspan=2 | 10
 * - style="height:2em"
 * rowspan=2 align=left | SenatorLafayetteYoung.jpg Lafayette Young
 * rowspan=2 | Republican
 * rowspan=2 nowrap | Nov 12, 1910 – Apr 11, 1911
 * rowspan=2 | Appointed to continue Dolliver's term.Lost election to finish Dolliver's term.


 * - style="height:2em"
 * rowspan=2

! rowspan=6 | 11
 * - style="height:2em"
 * rowspan=6 align=left | William Squire Kenyon.jpg William S. Kenyon
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Apr 12, 1911 – Feb 24, 1922
 * rowspan=1 | Elected to finish Dolliver's term.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1913.
 * rowspan=3 | 12


 * - style="height:2em"
 * rowspan=3 | 13
 * rowspan=3 | Re-elected in 1914.
 * rowspan=3 | Re-elected in 1914.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=2 | Re-elected in 1918.Resigned to become Judge of the U.S. Court of Appeals.
 * rowspan=5 | 13


 * - style="height:2em"
 * rowspan=3
 * rowspan=8 | 14
 * rowspan=6 | Re-elected in 1920.Lost renomination, then died.

! 12
 * - style="height:2em"
 * align=left | Charles A Rawson - US Senator.jpg Charles A. Rawson
 * | Republican
 * nowrap | Feb 24, 1922 – Dec 1, 1922
 * Appointed to continue Kenyon's term.Retired when his successor was elected.

! rowspan=3 | 13
 * - style="height:2em"
 * rowspan=3 align=left | Smith Wildman Brookhart.jpg Smith W. Brookhart
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Dec 1, 1922 – Apr 12, 1926
 * rowspan=2 | Elected to finish Kenyon's term.


 * - style="height:2em"


 * - style="height:2em"
 * Re-elected in 1924.Lost election challenge.
 * rowspan=6 | 14
 * rowspan=4

! rowspan=5 | 14
 * - style="height:2em"
 * rowspan=5 align=left | Daniel Steck.jpg Daniel F. Steck
 * rowspan=5 | Democratic
 * rowspan=5 nowrap | Apr 12, 1926 – Mar 3, 1931
 * rowspan=5 | Successfully challenged his predecessor's election.Lost re-election.


 * - style="height:2em"
 * nowrap | Jul 30, 1926 – Aug 7, 1926
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! 7
 * - style="height:2em"
 * Appointed to continue Cummins's term.Elected in 1926 to finish Cummins's term.Retired.
 * nowrap | Aug 7, 1926 – Mar 3, 1927
 * | Republican
 * align=right | David Wallace Stewart.jpg David W. Stewart

! rowspan=3 | 8
 * - style="height:2em"
 * rowspan=3 | 15
 * rowspan=3 | Elected in 1926.Lost renomination and then lost re-election as an Independent.
 * rowspan=3 nowrap | Mar 4, 1927 – Mar 3, 1933
 * rowspan=3 | Republican
 * rowspan=3 align=right | Smith Wildman Brookhart.jpg Smith W. Brookhart
 * rowspan=3 align=right | Smith Wildman Brookhart.jpg Smith W. Brookhart


 * - style="height:2em"

! rowspan=5 | 15
 * - style="height:2em"
 * rowspan=5 align=left | LJDickinson.jpg L. J. Dickinson
 * rowspan=5 | Republican
 * rowspan=5 nowrap | Mar 4, 1931 – Jan 3, 1937
 * rowspan=5 | Elected in 1930.Lost re-election.
 * rowspan=5 | 15

! rowspan=2 | 9
 * - style="height:2em"
 * rowspan=5 | 16
 * rowspan=2 | Elected in 1932.Died.
 * rowspan=2 nowrap | Mar 4, 1933 – Jul 16, 1936
 * rowspan=2 | Democratic
 * rowspan=2 align=right | SenatorRLouisMurphy.jpg Louis Murphy
 * rowspan=2 align=right | SenatorRLouisMurphy.jpg Louis Murphy


 * - style="height:2em"
 * rowspan=3


 * - style="height:2em"
 * nowrap | Jul 16, 1936 – Nov 3, 1936
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=5 | 10
 * - style="height:2em"
 * rowspan=2 | Elected to finish Murphy's term.
 * rowspan=5 nowrap | Nov 3, 1936 – Jan 3, 1945
 * rowspan=5 | Democratic
 * rowspan=5 align=right | Guy Mark Gillette.jpg Guy Gillette

! rowspan=3 | 16
 * - style="height:2em"
 * rowspan=3 align=left | Clyde L. Herring, US Senator.jpg Clyde L. Herring
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Jan 3, 1937 – Jan 3, 1943
 * rowspan=3 | Elected in 1936. Did not take seat until Jan 15, 1937 in order to remain Governor of Iowa.Lost re-election.
 * rowspan=3 | 16


 * - style="height:2em"
 * rowspan=3 | 17
 * rowspan=3 | Re-elected in 1938.Lost re-election.
 * rowspan=3 | Re-elected in 1938.Lost re-election.


 * - style="height:2em"


 * - style="height:2em"

! rowspan=3 | 17
 * - style="height:2em"
 * rowspan=3 align=left | George Allison Wilson.jpg George A. Wilson
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Jan 3, 1943 – Jan 3, 1949
 * rowspan=3 | Elected in 1942. Did not take seat until Jan 14, 1943 in order to remain Governor of Iowa.Lost re-election.
 * rowspan=3 | 17

! rowspan=12 | 11
 * - style="height:2em"
 * rowspan=3 | 18
 * rowspan=3 | Elected in 1944.
 * rowspan=12 nowrap | Jan 3, 1945 – Jan 3, 1969
 * rowspan=12 | Republican
 * rowspan=12 align=right | Bourke B. Hickenlooper.jpg Bourke B. Hickenlooper
 * rowspan=12 align=right | Bourke B. Hickenlooper.jpg Bourke B. Hickenlooper


 * - style="height:2em"

! rowspan=3 | 18
 * - style="height:2em"
 * rowspan=3 align=left | Guy Mark Gillette.jpg Guy Gillette
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Jan 3, 1949 – Jan 3, 1955
 * rowspan=3 | Elected in 1948.Lost re-election.
 * rowspan=3 | 18


 * - style="height:2em"
 * rowspan=3 | 19
 * rowspan=3 | Re-elected in 1950.
 * rowspan=3 | Re-elected in 1950.


 * - style="height:2em"

! rowspan=3 | 19
 * - style="height:2em"
 * rowspan=3 align=left | Thomas Ellsworth Martin.jpg Thomas E. Martin
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Jan 3, 1955 – Jan 3, 1961
 * rowspan=3 | Elected in 1954.Retired.
 * rowspan=3 | 19


 * - style="height:2em"
 * rowspan=3 | 20
 * rowspan=3 | Re-elected in 1956.
 * rowspan=3 | Re-elected in 1956.


 * - style="height:2em"

! rowspan=6 | 20
 * - style="height:2em"
 * rowspan=6 align=left | SenatorJackMillerIA.jpg Jack Miller
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Jan 3, 1961 – Jan 3, 1973
 * rowspan=3 | Elected in 1960.
 * rowspan=3 | 20


 * - style="height:2em"
 * rowspan=3 | 21
 * rowspan=3 | Re-elected in 1962Retired.
 * rowspan=3 | Re-elected in 1962Retired.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1966.Lost re-election.
 * rowspan=3 | 21

! rowspan=3 | 12
 * - style="height:2em"
 * rowspan=3 | 22
 * rowspan=3 | Elected in 1968.Retired.
 * rowspan=3 nowrap | Jan 3, 1969 – Jan 3, 1975
 * rowspan=3 | Democratic
 * rowspan=3 align=right | Harold Hughes, US Senator.jpg Harold Hughes
 * rowspan=3 align=right | Harold Hughes, US Senator.jpg Harold Hughes


 * - style="height:2em"

! rowspan=3 | 21
 * - style="height:2em"
 * rowspan=3 align=left | Senator dick clark.jpg Dick Clark
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Jan 3, 1973 – Jan 3, 1979
 * rowspan=3 | Elected in 1972.Lost re-election.
 * rowspan=3 | 22

! rowspan=3 | 13
 * - style="height:2em"
 * rowspan=3 | 23
 * rowspan=3 | Elected in 1974.Lost re-election.
 * rowspan=3 nowrap | Jan 3, 1975 – Jan 3, 1981
 * rowspan=3 | Democratic
 * rowspan=3 align=right | John Culver.jpg John Culver
 * rowspan=3 align=right | John Culver.jpg John Culver


 * - style="height:2em"

! rowspan=3 | 22
 * - style="height:2em"
 * rowspan=3 align=left | Roger Jepsen.JPG Roger Jepsen
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Jan 3, 1979 – Jan 3, 1985
 * rowspan=3 | Elected in 1978.Lost re-election.
 * rowspan=3 | 23

! rowspan=24 | 14
 * - style="height:2em"
 * rowspan=3 | 24
 * rowspan=3 | Elected in 1980.
 * rowspan=24 nowrap | Jan 3, 1981 – present
 * rowspan=24 | Republican
 * rowspan=24 align=right | Sen Chuck Grassley official.jpg Chuck Grassley
 * rowspan=24 align=right | Sen Chuck Grassley official.jpg Chuck Grassley


 * - style="height:2em"

! rowspan=15 | 23
 * - style="height:2em"
 * rowspan=15 align=left | Tom Harkin official portrait.jpg Tom Harkin
 * rowspan=15 | Democratic
 * rowspan=15 nowrap | Jan 3, 1985 – Jan 3, 2015
 * rowspan=3 | Elected in 1984.
 * rowspan=3 | 24


 * - style="height:2em"
 * rowspan=3 | 25
 * rowspan=3 | Re-elected in 1986.
 * rowspan=3 | Re-elected in 1986.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1990.
 * rowspan=3 | 25


 * - style="height:2em"
 * rowspan=3 | 26
 * rowspan=3 | Re-elected in 1992.
 * rowspan=3 | Re-elected in 1992.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1996.
 * rowspan=3 | 26


 * - style="height:2em"
 * rowspan=3 | 27
 * rowspan=3 | Re-elected in 1998.
 * rowspan=3 | Re-elected in 1998.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2002.
 * rowspan=3 | 27


 * - style="height:2em"
 * rowspan=3 | 28
 * rowspan=3 | Re-elected in 2004.
 * rowspan=3 | Re-elected in 2004.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2008Retired.
 * rowspan=3 | 28


 * - style="height:2em"
 * rowspan=3 | 29
 * rowspan=3 | Re-elected in 2010.
 * rowspan=3 | Re-elected in 2010.


 * - style="height:2em"

! rowspan=6 | 24
 * - style="height:2em"
 * rowspan=6 align=left | Joni Ernst, official portrait, 116th Congress 3.jpg Joni Ernst
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Jan 3, 2015 – present
 * rowspan=3 | Elected in 2014.
 * rowspan=3 | 29


 * - style="height:2em"
 * rowspan=3 | 30
 * rowspan=3 | Re-elected in 2016.
 * rowspan=3 | Re-elected in 2016.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 |Re-elected in 2020.
 * rowspan=3 | 30


 * - style="height:2em"
 * rowspan=3|31
 * rowspan=3| Re-elected in 2022.
 * rowspan=3| Re-elected in 2022.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=2 colspan=5 | To be determined in the 2026 election.
 * rowspan=2 | 31


 * - style="height:2em"
 * 32
 * colspan=5 | To be determined in the 2028 election.
 * colspan=5 | To be determined in the 2028 election.