Member
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Party
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Term
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Congress
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Electoral history
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District created March 4, 1863
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 Asahel W. Hubbard (Sioux City)
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Republican
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March 4, 1863 – March 3, 1869
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38th 39th 40th
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Elected in 1862. Re-elected in 1864. Re-elected in 1866. Retired.
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 Charles Pomeroy (Fort Dodge)
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Republican
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March 4, 1869 – March 3, 1871
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41st
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Elected in 1868. Lost renomination.
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 Jackson Orr (Montana)
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Republican
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March 4, 1871 – March 3, 1873
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42nd
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Elected in 1870. Redistricted to the 9th district.
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 William Loughridge (Oskaloosa)
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Republican
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March 4, 1873 – March 3, 1875
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43rd
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Elected in 1872. Lost renomination.
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 Ezekiel S. Sampson (Sigourney)
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Republican
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March 4, 1875 – March 3, 1879
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44th 45th
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Elected in 1874. Re-elected in 1876. Lost re-election.
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 James Weaver (Bloomfield)
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Greenback
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March 4, 1879 – March 3, 1881
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46th
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Elected in 1878. Retired to run for president.
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 Marsena E. Cutts (Oskaloosa)
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Republican
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March 4, 1881 – March 3, 1883
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47th
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Elected in 1880. Lost contested election.
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John C. Cook (Newton)
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Democratic
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March 3, 1883 – March 3, 1883
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Won contested election but only served one day. Lost re-election.
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 Marsena E. Cutts (Oskaloosa)
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Republican
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March 4, 1883 – September 1, 1883
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48th
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Elected in 1882. Died.
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Vacant
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September 1, 1883 – October 9, 1883
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John C. Cook (Newton)
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Democratic
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October 9, 1883 – March 3, 1885
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Elected to finish Cutts's term. Lost re-election.
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 James Weaver (Bloomfield)
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Greenback
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March 4, 1885 – March 3, 1889
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49th 50th
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Elected in 1884. Re-elected in 1886. Lost re-election.
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 John F. Lacey (Oskaloosa)
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Republican
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March 4, 1889 – March 3, 1891
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51st
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Elected in 1888. Lost re-election.
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 Frederick E. White (Webster)
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Democratic
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March 4, 1891 – March 3, 1893
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52nd
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Elected in 1890. Lost re-election.
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 John F. Lacey (Oskaloosa)
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Republican
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March 4, 1893 – March 3, 1907
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53rd 54th 55th 56th 57th 58th 59th
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Elected in 1892. Re-elected in 1894. Re-elected in 1896. Re-elected in 1898. Re-elected in 1900. Re-elected in 1902. Re-elected in 1904. Lost re-election.
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 Daniel W. Hamilton (Sigourney)
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Democratic
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March 4, 1907 – March 3, 1909
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60th
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Elected in 1906. Lost re-election.
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 Nathan E. Kendall (Albia)
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Republican
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March 4, 1909 – March 3, 1913
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61st 62nd
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Elected in 1908. Re-elected in 1910. Renominated but withdrew prior to election.
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 Sanford Kirkpatrick (Ottumwa)
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Democratic
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March 4, 1913 – March 3, 1915
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63rd
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Elected in 1912. Lost renomination.
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 C. William Ramseyer (Bloomfield)
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Republican
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March 4, 1915 – March 3, 1933
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64th 65th 66th 67th 68th 69th 70th 71st 72nd
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Elected in 1914. Re-elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922. Re-elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Redistricted to the 5th district and lost renomination there.
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 Cassius C. Dowell (Des Moines)
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Republican
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March 4, 1933 – January 3, 1935
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73rd
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Redistricted from the 7th district and re-elected in 1932. Lost re-election.
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 Hubert Utterback (Des Moines)
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Democratic
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January 3, 1935 – January 3, 1937
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74th
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Elected in 1934. Retired to run for U.S. Senator.
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 Cassius C. Dowell (Des Moines)
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Republican
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January 3, 1937 – February 4, 1940
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75th 76th
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Elected in 1936. Re-elected in 1938. Died.
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Vacant
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February 4, 1940 – March 5, 1940
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76th
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Robert K. Goodwin (Redfield)
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Republican
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March 5, 1940 – January 3, 1941
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76th
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Elected to finish Dowell's term. Retired.
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 Paul Cunningham (Des Moines)
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Republican
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January 3, 1941 – January 3, 1943
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77th
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Elected in 1940. Redistricted to the 5th district.
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 Fred C. Gilchrist (Laurens)
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Republican
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January 3, 1943 – January 3, 1945
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78th
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Redistricted from the 8th district and re-elected in 1942. Lost renomination.
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 James I. Dolliver (Fort Dodge)
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Republican
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January 3, 1945 – January 3, 1957
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79th 80th 81st 82nd 83rd 84th
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Elected in 1944. Re-elected in 1946. Re-elected in 1948. Re-elected in 1950. Re-elected in 1952. Re-elected in 1954. Lost re-election.
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 Merwin Coad (Boone)
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Democratic
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January 3, 1957 – January 3, 1963
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85th 86th 87th
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Elected in 1956. Re-elected in 1958. Re-elected in 1960. Retired.
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 Charles B. Hoeven (Alton)
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Republican
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January 3, 1963 – January 3, 1965
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88th
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Redistricted from the 8th district and re-elected in 1962. Retired.
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 Stanley L. Greigg (Sioux City)
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Democratic
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January 3, 1965 – January 3, 1967
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89th
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Elected in 1964. Lost re-election.
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 Wiley Mayne (Sioux City)
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Republican
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January 3, 1967 – January 3, 1975
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90th 91st 92nd 93rd
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Elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Lost re-election.
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 Berkley Bedell (Spirit Lake)
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Democratic
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January 3, 1975 – January 3, 1987
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94th 95th 96th 97th 98th 99th
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Elected in 1974. Re-elected in 1976. Re-elected in 1978. Re-elected in 1980. Re-elected in 1982. Re-elected in 1984. Retired.
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 Fred Grandy (Sioux City)
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Republican
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January 3, 1987 – January 3, 1993
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100th 101st 102nd
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Elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the 5th district.
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District eliminated January 3, 1993
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