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Iowa was admitted to the Union on December 28, 1846. Its current Senators are Republicans Charles Grassley, who has served since 1981, and Joni Ernst, who has served since 2015. == List of Senators == |- style="height:2em" | rowspan=2 colspan=3 | ''Vacant'' | rowspan=2 | December 28, 1846 – December 7, 1848 | rowspan=2 | Legislature failed to elect due to a three-way split that prevented any candidate from earning the required number of 30 legislators' votes. | rowspan=2 | — | bgcolor=gray class=small | | rowspan=2 | — | rowspan=2 | Legislature failed to elect due to a three-way split that prevented any candidate from earning the required number of 30 legislators' votes.〔 | rowspan=2 | December 28, 1846 – December 7, 1848 | rowspan=2 colspan=3 | ''Vacant'' |- style="height:2em" | rowspan=2 class=small | |- style="height:2em" ! rowspan=9 | 1 | rowspan=9 align=left | 100px George W. Jones | rowspan=9 | Democratic | rowspan=9 | December 7, 1848 – March 3, 1859 | rowspan=3 | Elected in 1848. | rowspan=3 | 1 | 1 | Elected in 1848. | rowspan=4 | December 7, 1848 – February 22, 1855 | rowspan=4 | Democratic | rowspan=4 align=right | 100px Augustus C. Dodge ! rowspan=4 | 1 |- style="height:2em" | bgcolor=gray class=small | | rowspan=4 | 2 | rowspan=3 | Re-elected in 1849. Resigned to become U.S. Minister to Spain, having lost re-election. |- style="height:2em" | class=small | |- style="height:2em" | rowspan=6 | Re-elected in 1852. Lost renomination. | rowspan=6 | 2 | rowspan=2 bgcolor=gray class=small | |- style="height:2em" | | February 22, 1855 – March 3, 1855 | colspan=3 | ''Vacant'' |- style="height:2em" | rowspan=3 class=small | | rowspan=5 | 3 | Elected in 1855. Elected invalidated, as the Iowa Senate had not participated in it. | March 4, 1855 – January 5, 1857 | | Free Soil | align=right | 100px James Harlan ! rowspan=8 | 2 |- style="height:2em" | | January 5, 1857 – January 29, 1857 | colspan=2 | ''Vacant'' |- style="height:2em" | rowspan=3 | Re-elected to finish his vacant term. | rowspan=6 | January 29, 1857 – May 15, 1865 | rowspan=6 | Republican | rowspan=6 align=right | 100px James Harlan |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" ! rowspan=8 | 2 | rowspan=8 align=left | 100px James W. Grimes | rowspan=8 | Republican | rowspan=8 | March 4, 1859 – December 6, 1869 | rowspan=3 | Elected in 1859. | rowspan=3 | 3 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=5 | 4 | rowspan=3 |Re-elected in 1861. Resigned to become U.S. Secretary of the Interior. |- style="height:2em" | class=small | |- style="height:2em" | rowspan=5 | Re-elected in 1865. Resigned due to ill health. | rowspan=7 | 4 | rowspan=3 bgcolor=gray class=small | |- style="height:2em" | | May 15, 1865 – January 13, 1866 | colspan=3 | ''Vacant'' |- style="height:2em" | Elected to finish Harlan's term. Retired. | January 13, 1866 – March 3, 1867 | | Republican | align=right | 100px Samuel J. Kirkwood ! 3 |- style="height:2em" | class=small | | rowspan=5 | 5 | rowspan=5 | Elected in 1867. Lost re-election. | rowspan=5 | March 4, 1867 – March 3, 1873 | rowspan=5 | Republican | rowspan=5 align=right | 100px James Harlan ! rowspan=5 | 4 |- style="height:2em" | rowspan=3 bgcolor=gray class=small | |- style="height:2em" | colspan=3 | ''Vacant'' | December 6, 1869 – January 18, 1870 |- style="height:2em" ! 3 | align=left | 100px James B. Howell | | Republican | January 18, 1870 – March 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 | March 4, 1871 – March 3, 1877 | rowspan=3 | Elected in 1870. Retired. | rowspan=3 | 5 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 6 | rowspan=3 | Elected in 1872. | rowspan=21 | March 4, 1873 – August 4, 1908 | rowspan=21 | Republican | rowspan=21 align=right | 100px William B. Allison ! rowspan=21 | 5 |- style="height:2em" | class=small | |- style="height:2em" ! rowspan=3 | 5 | rowspan=3 align=left | 100px Samuel J. Kirkwood | rowspan=3 | Republican | rowspan=3 | March 4, 1877 – March 7, 1881 | rowspan=3 | Elected in 1876. Resigned to become U.S. Secretary of the Interior. | rowspan=4 | 6 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=4 | 7 | rowspan=4 | Re-elected in 1878. |- style="height:2em" | rowspan=2 bgcolor=gray class=small | |- style="height:2em" ! 6 | align=left | 100px James W. McDill | | Republican | March 8, 1881 – March 3, 1883 | Appointed to continue Kirkwood's term. Elected 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 | March 4, 1883 – March 3, 1895 | rowspan=3 | Elected in 1882. | rowspan=3 | 7 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 8 | rowspan=3 | Re-elected in 1884. |- style="height:2em" | class=small | |- style="height:2em" | rowspan=3 | Re-elected in 1888. Retired. | rowspan=3 | 8 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 9 | rowspan=3 | Re-elected in 1890. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" ! rowspan=3 | 8 | rowspan=3 align=left | 100px John H. Gear | rowspan=3 | Republican | rowspan=3 | March 4, 1895 – July 14, 1900 | rowspan=3 | Elected in 1894. Died. | rowspan=5 | 9 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=5 | 10 | rowspan=5 | Re-elected in 1896. |- style="height:2em" | rowspan=3 class=small | |- style="height:2em" | colspan=3 | ''Vacant'' | July 14, 1900 – August 22, 1900 |- style="height:2em" ! rowspan=8 | 9 | rowspan=8 align=left | 100px Jonathan P. Dolliver | rowspan=8 | Republican | rowspan=8 | August 22, 1900 – October 15, 1910 | Appointed to finish Gear's term. |- style="height:2em" | rowspan=3 | Elected to full term in 1900 | rowspan=3 | 10 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=5 | 11 | rowspan=3 | Re-elected in 1902. Died. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" | rowspan=4 | Re-elected in 1906. Died. | rowspan=8 | 11 | rowspan=3 class=small | |- style="height:2em" | | August 4, 1908 – November 24, 1908 | colspan=3 | ''Vacant'' |- style="height:2em" | Appointed to finish Allison's term. | rowspan=16 | November 24, 1908 – July 30, 1926 | rowspan=16 | Republican | rowspan=16 align=right | 100px Albert B. Cummins ! rowspan=16 | 6 |- style="height:2em" | rowspan=4 bgcolor=gray class=small | | rowspan=6 | 12 | rowspan=6 | Elected to full term in 1908 |- style="height:2em" | colspan=3 | ''Vacant'' | October 15, 1910 – November 12, 1910 |- style="height:2em" ! 10 | align=left | 100px Lafayette Young | | Republican | November 12, 1910 – April 11, 1911 | Appointed to continue Dolliver's term. Lost election to finish Dolliver's term. |- style="height:2em" ! rowspan=7 | 11 | rowspan=7 align=left | 100px William S. Kenyon | rowspan=7 | Republican | rowspan=7 | April 12, 1911 – February 24, 1922 | rowspan=2 | Elected to finish Dolliver's term. |- style="height:2em" | class=small | |- style="height:2em" | rowspan=3 | Re-elected in 1912. | rowspan=3 | 12 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 13 | rowspan=3 | Re-elected in 1914. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" | rowspan=2 | Re-elected in 1918. Resigned to become Judge of the U.S. Court of Appeals. | rowspan=5 | 13 | class=small | |- style="height:2em" | rowspan=3 bgcolor=gray class=small | | rowspan=8 | 14 | rowspan=6 | Re-elected in 1920. Lost renomination, then died. |- style="height:2em" ! 12 | align=left | 100px Charles A. Rawson | | Republican | February 24, 1922 – December 1, 1922 | Appointed to continue Kenyon's term. Retired when successor elected. |- style="height:2em" ! rowspan=3 | 13 | rowspan=3 align=left | 100px Smith W. Brookhart | rowspan=3 | Republican | rowspan=3 | December 1, 1922 – April 12, 1926 | rowspan=2 | Elected to finish Kenyon's term. |- style="height:2em" | class=small | |- style="height:2em" | Re-elected in 1924. Lost election challenge. | rowspan=6 | 14 | rowspan=4 bgcolor=gray class=small | |- style="height:2em" ! rowspan=5 | 14 | rowspan=5 align=left | 100px Daniel F. Steck | rowspan=5 | Democratic | rowspan=5 | April 12, 1926 – March 3, 1931 | rowspan=5 | Successfully challenged predecessor's election Lost re-election. |- style="height:2em" | | July 30, 1926 – August 7, 1926 | colspan=3 | ''Vacant'' |- style="height:2em" | Appointed to continue Cummins's term. Elected to finish Cummins's term. Retired. | August 7, 1926 – March 3, 1927 | | Republican | align=right | 100px David W. Stewart ! 7 |- style="height:2em" | class=small | | rowspan=3 | 15 | rowspan=3 | Elected in 1926. Lost renomination and then lost re-election as an Independent. | rowspan=3 | March 4, 1927 – March 3, 1933 | rowspan=3 | Republican | rowspan=3 align=right | 100px Smith W. Brookhart ! rowspan=3 | 8 |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" ! rowspan=5 | 15 | rowspan=5 align=left | 100px Lester J. Dickinson | rowspan=5 | Republican | rowspan=5 | March 4, 1931 – January 3, 1937 | rowspan=5 | Elected in 1930. Lost re-election. | rowspan=5 | 15 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=6 | 16 | rowspan=2 | Elected in 1932. Died. | rowspan=2 | March 4, 1933 – July 16, 1936 | rowspan=2 | Democratic | rowspan=2 align=right | 100px Richard L. Murphy ! rowspan=2 | 9 |- style="height:2em" | rowspan=3 class=small | |- style="height:2em" | | July 16, 1936 – November 3, 1936 | colspan=3 | ''Vacant'' |- style="height:2em" | rowspan=3 | Elected to finish Murphy's term. | rowspan=7 | November 3, 1936 – January 3, 1945 | rowspan=7 | Democratic | rowspan=7 align=right | 100px Guy Gillette ! rowspan=7 | 10 |- style="height:2em" | colspan=3 | Vacant | January 3, 1937 – January 15, 1937 | Successor failed to qualify until term as Governor ended. | rowspan=4 | 16 | rowspan=2 bgcolor=gray class=small | |- style="height:2em" ! rowspan=3 | 16 | rowspan=3 align=left | 100px Clyde L. Herring | rowspan=3 | Democratic | rowspan=3 | January 15, 1937 – January 3, 1943 | rowspan=3 | Elected in 1936. Lost re-election. |- style="height:2em" | class=small | | rowspan=4 | 17 | rowspan=4 | Re-elected in 1938. Lost re-election. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" | colspan=3 | ''Vacant'' | January 3, 1943 – January 14, 1943 | | rowspan=4 | 17 | rowspan=2 class=small | |- style="height:2em" ! rowspan=3 | 17 | rowspan=3 align=left | 100px George A. Wilson | rowspan=3 | Republican | rowspan=3 | January 14, 1943 – January 3, 1949 | rowspan=3 | Elected in 1942 but waited to finish gubernatorial term. Lost re-election. |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 18 | rowspan=3 | Elected in 1944. | rowspan=12 | January 3, 1945 – January 3, 1969 | rowspan=12 | Republican | rowspan=12 align=right | 100px Bourke B. Hickenlooper ! rowspan=12 | 11 |- style="height:2em" | class=small | |- style="height:2em" ! rowspan=3 | 18 | rowspan=3 align=left | 100px Guy Gillette | rowspan=3 | Democratic | rowspan=3 | January 3, 1949 – January 3, 1955 | rowspan=3 | Elected in 1948. Lost re-election. | rowspan=3 | 18 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 19 | rowspan=3 | Re-elected in 1950. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" ! rowspan=3 | 19 | rowspan=3 align=left | 100px Thomas E. Martin | rowspan=3 | Republican | rowspan=3 | January 3, 1955 – January 3, 1961 | rowspan=3 | Elected in 1954. Retired. | rowspan=3 | 19 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 20 | rowspan=3 | Re-elected in 1956. |- style="height:2em" | class=small | |- style="height:2em" ! rowspan=6 | 20 | rowspan=6 align=left | 100px Jack Miller | rowspan=6 | Republican | rowspan=6 | January 3, 1961 – January 3, 1973 | rowspan=3 | Elected in 1960. | rowspan=3 | 20 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 21 | rowspan=3 | Re-elected in 1962 Retired. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" | rowspan=3 | Re-elected in 1966. Lost re-election. | rowspan=3 | 21 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 22 | rowspan=3 | Elected in 1968. Retired. | rowspan=3 | January 3, 1969 – January 3, 1975 | rowspan=3 | Democratic | rowspan=3 align=right | 100px Harold Hughes ! rowspan=3 | 12 |- style="height:2em" | class=small | |- style="height:2em" ! rowspan=3 | 21 | rowspan=3 align=left | 100px Dick Clark | rowspan=3 | Democratic | rowspan=3 | January 3, 1973 – January 3, 1979 | rowspan=3 | Elected in 1972. Lost re-election. | rowspan=3 | 22 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 23 | rowspan=3 | Elected in 1974. Lost re-election. | rowspan=3 | January 3, 1975 – January 3, 1981 | rowspan=3 | Democratic | rowspan=3 align=right | 100px John Culver ! rowspan=3 | 13 |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" ! rowspan=3 | 22 | rowspan=3 align=left | 100px Roger Jepsen | rowspan=3 | Republican | rowspan=3 | January 3, 1979 – January 3, 1985 | rowspan=3 | Elected in 1978. Lost re-election. | rowspan=3 | 23 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 24 | rowspan=3 | Elected in 1980. | rowspan=18 | January 3, 1981 – Present | rowspan=18 | Republican | rowspan=18 align=right | 100px Chuck Grassley ! rowspan=18 | 14 |- style="height:2em" | class=small | |- style="height:2em" ! rowspan=15 | 23 | rowspan=15 align=left | 100px Tom Harkin | rowspan=15 | Democratic | rowspan=15 | January 3, 1985 – January 3, 2015 | rowspan=3 | Elected in 1984. | rowspan=3 | 24 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 25 | rowspan=3 | Re-elected in 1986. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" | rowspan=3 | Re-elected in 1990. | rowspan=3 | 25 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 26 | rowspan=3 | Re-elected in 1992. |- style="height:2em" | class=small | |- style="height:2em" | rowspan=3 | Re-elected in 1996. | rowspan=3 | 26 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 27 | rowspan=3 | Re-elected in 1998. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" | rowspan=3 | Re-elected in 2002. | rowspan=3 | 27 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 28 | rowspan=3 | Re-elected in 2004. |- style="height:2em" | class=small | |- style="height:2em" | rowspan=3 | Re-elected in 2008 Retired. | rowspan=3 | 28 | bgcolor=gray class=small | |- style="height:2em" | class=small | | rowspan=3 | 29 | rowspan=3 | Re-elected in 2010. |- style="height:2em" | bgcolor=gray class=small | |- style="height:2em" ! rowspan=3 | 24 | rowspan=3 align=left | 100px Joni Ernst | rowspan=3 | Republican | rowspan=3 | January 3, 2015 – Present | rowspan=3 | Elected in 2014. | rowspan=3 | 29 | class=small | |- style="height:2em" | bgcolor=gray class=small | | rowspan=3 | 30 | rowspan=3 colspan=5 | To be determined in the 2016 election. |- style="height:2em" | class=small | |- style="height:2em" | colspan=5 | To be determined in the 2020 election. | 30 | bgcolor=gray class=small | |- valign=top ! # ! Senator ! Party ! Years in office ! Electoral history ! T e r m ! rowspan=2 | C o n g r e s s ! T e r m ! Electoral history ! Years in office ! Party ! Senator ! # |- valign=top ! colspan=6 | Class 2 ! colspan=6 | Class 3 |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of United States Senators from Iowa」の詳細全文を読む スポンサード リンク
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