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 | Legislature failed to elect.

| rowspan=2 nowrap | Dec 28, 1846 – Dec 7, 1848

| rowspan=2 colspan=3 | Vacant

|- style="height:2em"

| rowspan=2

|- style="height:2em"

! rowspan=9 | 1

| rowspan=9 align=left | 100px 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 | 100px Augustus C. Dodge

! rowspan=4 | 1

|- style="height:2em"

| rowspan=4 | 2

| rowspan=3 | Re-elected in 1849.Resigned to become U.S. Minister to Spain, having lost re-election.

|- 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

|- 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 | 100px James Harlan

! rowspan=8 | 2

|- style="height:2em"

| nowrap | Jan 5, 1857 – Jan 29, 1857

| 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 | 100px James Harlan

|- style="height:2em"

! rowspan=8 | 2

| rowspan=8 align=left | 100px 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.

|- 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

|- 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 | 100px Samuel J. Kirkwood

! 3

|- 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 | 100px James Harlan

! rowspan=5 | 4

|- style="height:2em"

| rowspan=3

|- style="height:2em"

| colspan=3 | Vacant

| nowrap | Dec 6, 1869 – Jan 18, 1870

|- style="height:2em"

! 3

| align=left | 100px James B. Howell

| | Republican

| nowrap | Jan 18, 1870 – Mar 3, 1871

| Elected to finish Grimes's term.Retired.

|- style="height:2em"

! rowspan=3 | 4

| rowspan=3 align=left | 100px George G. Wright

| rowspan=3 | Republican

| rowspan=3 nowrap | Mar 4, 1871 – Mar 3, 1877

| rowspan=3 | Elected in 1870.Retired.

| rowspan=3 | 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 | 100px William B. Allison

! rowspan=21 | 5

|- style="height:2em"

! rowspan=3 | 5

| rowspan=3 align=left | 100px 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.

|- style="height:2em"

| rowspan=2

|- style="height:2em"

! 6

| align=left | 100px 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.

|- style="height:2em"

! rowspan=6 | 7

| rowspan=6 align=left | 100px 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.

|- 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.

|- style="height:2em"

! rowspan=3 | 8

| rowspan=3 align=left | 100px 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.

|- style="height:2em"

| rowspan=3

|- style="height:2em"

| colspan=3 | Vacant

| nowrap | Jul 14, 1900 – Aug 22, 1900

|- style="height:2em"

! rowspan=8 | 9

| rowspan=8 align=left | 100px 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.

|- 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

|- 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 | 100px Albert B. Cummins

! rowspan=16 | 6

|- 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

|- style="height:2em"

! rowspan=2 | 10

| rowspan=2 align=left | 100px 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

|- style="height:2em"

! rowspan=6 | 11

| rowspan=6 align=left | 100px 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.

|- 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.

|- style="height:2em"

! 12

| align=left | 100px Charles A. Rawson

| | Republican

| nowrap | Feb 24, 1922 – Dec 1, 1922

| Appointed to continue Kenyon's term.Retired when his successor was elected.

|- style="height:2em"

! rowspan=3 | 13

| rowspan=3 align=left | 100px 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"

| Re-elected in 1924.Lost election challenge.

| rowspan=6 | 14

| rowspan=4

|- style="height:2em"

! rowspan=5 | 14

| rowspan=5 align=left | 100px 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

|- 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 | 100px David W. Stewart

! 7

|- 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 | 100px Smith W. Brookhart

! rowspan=3 | 8

|- style="height:2em"

! rowspan=5 | 15

| rowspan=5 align=left | 100px 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

|- 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 | 100px Louis Murphy

! rowspan=2 | 9

|- style="height:2em"

| rowspan=3

|- style="height:2em"

| nowrap | Jul 16, 1936 – Nov 3, 1936

| colspan=3 | Vacant

|- 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 | 100px Guy Gillette

! rowspan=5 | 10

|- style="height:2em"

! rowspan=3 | 16

| rowspan=3 align=left | 100px 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.

|- style="height:2em"

! rowspan=3 | 17

| rowspan=3 align=left | 100px 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

|- 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 | 100px Bourke B. Hickenlooper

! rowspan=12 | 11

|- style="height:2em"

! rowspan=3 | 18

| rowspan=3 align=left | 100px 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.

|- style="height:2em"

! rowspan=3 | 19

| rowspan=3 align=left | 100px 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.

|- style="height:2em"

! rowspan=6 | 20

| rowspan=6 align=left | 100px 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.

|- style="height:2em"

| rowspan=3 | Re-elected in 1966.Lost re-election.

| rowspan=3 | 21

|- 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 | 100px Harold Hughes

! rowspan=3 | 12

|- style="height:2em"

! rowspan=3 | 21

| rowspan=3 align=left | 100px 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

|- 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 | 100px John Culver

! rowspan=3 | 13

|- style="height:2em"

! rowspan=3 | 22

| rowspan=3 align=left | 100px 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

|- 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 | 100px Chuck Grassley

! rowspan=24 | 14

|- style="height:2em"

! rowspan=15 | 23

| rowspan=15 align=left | 100px 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.

|- style="height:2em"

| rowspan=3 | Re-elected in 1990.

| rowspan=3 | 25

|- style="height:2em"

| rowspan=3 | 26

| rowspan=3 | Re-elected in 1992.

|- style="height:2em"

| rowspan=3 | Re-elected in 1996.

| rowspan=3 | 26

|- style="height:2em"

| rowspan=3 | 27

| rowspan=3 | Re-elected in 1998.

|- style="height:2em"

| rowspan=3 | Re-elected in 2002.

| rowspan=3 | 27

|- style="height:2em"

| rowspan=3 | 28

| rowspan=3 | Re-elected in 2004.

|- style="height:2em"

| rowspan=3 | Re-elected in 2008Retired.

| rowspan=3 | 28

|- style="height:2em"

| rowspan=3 | 29

| rowspan=3 | Re-elected in 2010.

|- style="height:2em"

! rowspan=6 | 24

| rowspan=6 align=left | 100px 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.

|- style="height:2em"

| rowspan=3 |Re-elected in 2020.Retiring at the end of term.

| rowspan=3 | 30

|- style="height:2em"

| rowspan=3|31

| rowspan=3| Re-elected in 2022.

|- 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.

List of United States senators from Iowa

List of senators

See also

Notes

References