Iowa was admitted to the Union on December 28, 1846. Its current Senators are Republican Charles Grassley, who has served since 1981, and Democrat Tom Harkin, who has served since 1985. With a combined service time of sixty years as of the 113th Congress, Iowa's current delegation is the most senior in the Senate.
| # | Senator | Party | Years | Term | Electoral history |
|---|---|---|---|---|---|
| 1 | Democratic | December 7, 1848 – March 4, 1859 |
1 | Elected in 1848 | |
| 2 | Re-elected in 1853 Lost renomination |
||||
| 2 | Republican | March 4, 1859 – December 6, 1869 |
3 | Elected in 1859 | |
| 4 | Re-elected in 1865 Resigned due to ill health |
||||
| Vacant | December 6, 1869 – January 18, 1870 |
||||
| 3 | Republican | January 18, 1870 – March 4, 1871 |
Elected to finish Grimes's term Retired |
||
| 4 | Republican | March 4, 1871 – March 4, 1877 |
5 | Elected in 1870 Retired |
|
| 5 | Republican | March 4, 1877 – March 7, 1881 |
6 | Elected in 1876 Resigned to become U.S. Secretary of the Interior |
|
| 6 | Republican | March 8, 1881 – March 4, 1883 |
Appointed to continue Kirkwood's term Elected to finish Kirkwood's term Retired |
||
| 7 | Republican | March 4, 1883 – March 4, 1895 |
7 | Elected in 1882 | |
| 8 | Re-elected in 1888 Retired |
||||
| 8 | Republican | March 4, 1895 – July 14, 1900 |
9 | Elected in 1894 Died |
|
| Vacant | July 14, 1900 – August 22, 1900 |
||||
| 9 | Republican | August 22, 1900 – October 15, 1910 |
Appointed to finish Gear's term | ||
| 10 | Elected to full term in 1900 | ||||
| 11 | Re-elected in 1906 Died |
||||
| Vacant | October 15, 1910 – November 12, 1910 |
||||
| 10 | Republican | November 12, 1910 – April 11, 1911 |
Appointed to continue Dolliver's term Lost election to finish Dolliver's term |
||
| 11 | Republican | April 12, 1911 – February 24, 1922 |
Elected to finish Dolliver's term | ||
| 12 | Re-elected in 1912 | ||||
| 13 | Re-elected in 1918 Resigned to become Judge of the U.S. Court of Appeals |
||||
| 12 | Republican | February 24, 1922 – December 1, 1922 |
Appointed to continue Kenyon's term Retired when successor elected |
||
| 13 | Republican | December 1, 1922 – April 12, 1926 |
Elected to finish Kenyon's term | ||
| 14 | Re-elected in 1924 Lost election challenge |
||||
| 14 | Democratic | April 12, 1926 – March 4, 1931 |
Successfully challenged predecessor's election Lost re-election |
||
| 15 | Republican | March 4, 1931 – January 3, 1937 |
15 | Elected in 1930 Lost re-election |
|
| Vacant | January 3, 1937 – January 15, 1937 |
16 | Successor failed to qualify until term as Governor ended | ||
| 16 | Democratic | January 15, 1937 – January 3, 1943 |
Elected in 1936 Lost re-election |
||
| Vacant | January 3, 1943 – January 14, 1943 |
17 | |||
| 17 | Republican | January 14, 1943 – January 3, 1949 |
Elected in 1942 but waited to finish gubernatorial term Lost re-election |
||
| 18 | Democratic | January 3, 1949 – January 3, 1955 |
18 | Elected in 1948 Lost re-election |
|
| 19 | Republican | January 3, 1955 – January 3, 1961 |
19 | Elected in 1954 Retired |
|
| 20 | Republican | January 3, 1961 – January 3, 1973 |
20 | Elected in 1960 | |
| 21 | Re-elected in 1966 Lost re-election |
||||
| 21 | Democratic | January 3, 1973 – January 3, 1979 |
22 | Elected in 1972 Lost re-election |
|
| 22 | Republican | January 3, 1979 – January 3, 1985 |
23 | Elected in 1978 Lost re-election |
|
| 23 | Democratic | January 3, 1985 – Present |
24 | Elected in 1984 | |
| 25 | Re-elected in 1990 | ||||
| 26 | Re-elected in 1996 | ||||
| 27 | Re-elected in 2002 | ||||
| 28 | Re-elected in 2008 | ||||
| # | Senator | Party | Years | Term | Electoral history |
| # | Senator | Party | Years | Term | Electoral history |
|---|---|---|---|---|---|
| 1 | Democratic | December 7, 1848 – February 22, 1855 |
1 | Elected in 1848 | |
| 2 | Re-elected in 1849 Resigned to become U.S. Minister to Spain, having lost re-election |
||||
| Vacant | February 22, 1855 – March 4, 1855 |
||||
| 2 | Free Soil | March 4, 1855 – January 5, 1857 |
3 | Elected in 1855 Elected invalidated, as the Iowa Senate had not participated in it |
|
| Vacant | January 5, 1857 – January 29, 1857 |
||||
| Republican | January 29, 1857 – May 15, 1865 |
Re-elected after vacancy declared by Senate due to irregularities in the legislative proceedings that first elected Harlan to the Senate | |||
| 4 | Re-elected in 1861 Resigned to become U.S. Secretary of the Interior |
||||
| Vacant | May 15, 1865 – January 13, 1866 |
||||
| 3 | Republican | January 13, 1866 – March 4, 1867 |
Elected to finish Harlan's term Retired |
||
| 4 | Republican | March 4, 1867 – March 4, 1873 |
5 | Elected in 1867 Lost re-election |
|
| 5 | Republican | March 4, 1873 – August 4, 1908 |
6 | Elected in 1872 | |
| 7 | Re-elected in 1878 | ||||
| 8 | Re-elected in 1884 | ||||
| 9 | Re-elected in 1890 | ||||
| 10 | Re-elected in 1896 | ||||
| 11 | Re-elected in 1902 Died |
||||
| Vacant | August 4, 1908 – November 24, 1908 |
||||
| 6 | Republican | November 24, 1908 – July 30, 1926 |
Appointed to finish Allison's term | ||
| 12 | Elected to full term in 1908 | ||||
| 13 | Re-elected in 1914 | ||||
| 14 | Re-elected in 1920 Died, having lost renomination |
||||
| Vacant | July 30, 1926 – August 7, 1926 |
||||
| 7 | Republican | August 7, 1926 – March 4, 1927 |
Appointed to continue Cummins's term Elected to finish Cummins's term Retired |
||
| 8 | Republican | March 4, 1927 – March 4, 1933 |
15 | Elected in 1926 Lost renomination and re-election as an Independent |
|
| 9 | Democratic | March 4, 1933 – July 16, 1936 |
16 | Elected in 1932 Died |
|
| Vacant | July 16, 1936 – November 3, 1936 |
||||
| 10 | Democratic | November 3, 1936 – January 3, 1945 |
Elected to finish Murphy's term | ||
| 17 | Re-elected in 1938 Lost re-election |
||||
| 11 | Republican | January 3, 1945 – January 3, 1969 |
18 | Elected in 1944 | |
| 19 | Re-elected in 1950 | ||||
| 20 | Re-elected in 1956 | ||||
| 21 | Re-elected in 1962 Retired |
||||
| 12 | Democratic | January 3, 1969 – January 3, 1975 |
22 | Elected in 1968 Retired |
|
| 13 | Democratic | January 3, 1975 – January 3, 1981 |
23 | Elected in 1974 Lost re-election |
|
| 14 | Republican | January 3, 1981 – Present |
24 | Elected in 1980 | |
| 25 | Re-elected in 1986 | ||||
| 26 | Re-elected in 1992 | ||||
| 27 | Re-elected in 1998 | ||||
| 28 | Re-elected in 2004 | ||||
| 29 | Re-elected in 2010 | ||||
| # | Senator | Party | Years | Term | Electoral history |
|
||||||||||||||
Here you can share your comments or contribute with more information, content, resources or links about this topic.