President –
Congress –
State Offices –
State Legislature
Data I Have:
President –
U.S. Senate –
U.S. House –
Governor –
Lieutenant Governor –
Secretary of State –
Attorney General –
Treasurer –
Auditor –
Agriculture Commissioner
| Election | Class 2 Senator | Class 3 Senator | Representative(s) |
|---|
| 1846 | Jones (D) | – | – |
| 1848 | Jones (D) | Dodge (D) | 1 DEM, 1 Whig |
| 1850 | – | – | 2 DEM |
| 1852 | Jones (D) | – | 1 DEM, 1 Whig |
| 1854 | – | Harlan (FS) | 1 DEM, 1 Whig |
| 1856 | – | – | 2 GOP |
| 1858 | Grimes (R) | – | 2 GOP |
| 1860 | – | Harlan (R) | 2 GOP |
| 1862 | – | – | 6 GOP |
| 1864 | Grimes (R) | – | 6 GOP |
| 1866 | – | Harlan (R) | 6 GOP |
| 1868 | – | – | 6 GOP |
| 1870 | Wright (R) | – | 6 GOP |
| 1872 | – | Allison (R) | 9 GOP |
| 1874 | – | – | 8 GOP, 1 DEM |
| 1876 | Kirkwood (R) | – | 9 GOP |
| 1878 | – | Allison (R) | 7 GOP, 2 GB |
| 1880 | – | – | 9 GOP |
| 1882 | J. Wilson (R) | – | 8 GOP, 2 DEM, 1 GB |
| 1884 | – | Allison (R) | 7 GOP, 2 DEM, 1 GB |
| 1886 | – | – | 8 GOP, 1 DEM, 1 GB, 1 IR |
| 1888 | J. Wilson (R) | – | 10 GOP, 1 DEM |
| 1890 | – | Allison (R) | 6 DEM, 5 GOP |
| 1892 | – | – | 10 GOP, 1 DEM |
| 1894 | Gear (R) | – | 11 GOP |
| 1896 | – | Allison (R) | 11 GOP |
| 1898 | – | – | 11 GOP |
| 1900 | Dolliver (R) | – | 11 GOP |
| 1902 | – | Allison (R) | 10 GOP, 1 DEM |
| 1904 | – | – | 11 GOP |
| 1906 | Dolliver (R) | – | 10 GOP, 1 DEM |
| 1908 | – | Cummins (R) | 10 GOP, 1 DEM |
| 1910 | – | – | 10 GOP, 1 DEM |
| 1912 | Kenyon (R) | – | 8 GOP, 3 DEM |
| 1914 | – | Cummins (R) | 10 GOP, 1 DEM |
| 1916 | – | – | 11 GOP |
| 1918 | Kenyon (R) | – | 11 GOP |
| 1920 | – | Cummins (R) | 11 GOP |
| 1922 | – | – | 11 GOP |
| 1924 | Brookhart (R) | – | 11 GOP |
| 1926 | – | Brookhaven (R) | 11 GOP |
| 1928 | – | – | 11 GOP |
| 1930 | Dickinson (R) | – | 10 GOP, 1 DEM |
| 1932 | – | Murphy (D) | 6 DEM, 3 GOP |
| 1934 | – | – | 6 DEM, 3 GOP |
| 1936 | Herring (D) | – | 5 DEM, 4 GOP |
| 1938 | – | Gillette (D) | 7 GOP, 2 DEM |
| 1940 | – | – | 8 GOP, 1 DEM |
| 1942 | Wilson (R) | – | 8 GOP |
| 1944 | – | B. Hickenlooper (R) | 8 GOP |
| 1946 | – | – | 8 GOP |
| 1948 | Gillette (D) | – | 8 GOP |
| 1950 | – | B. Hickenlooper (R) | 8 GOP |
| 1952 | – | – | 8 GOP |
| 1954 | Martin (R) | – | 8 GOP |
| 1956 | – | B. Hickenlooper (R) | 7 GOP, 1 DEM |
| 1958 | – | – | 4 DEM, 4 GOP |
| 1960 | Miller (R) | – | 6 GOP, 2 DEM |
| 1962 | – | B. Hickenlooper (R) | 6 GOP, 1 DEM |
| 1964 | – | – | 6 DEM, 1 GOP |
| 1966 | Miller (R) | – | 5 GOP, 2 DEM |
| 1968 | – | Hughes (D) | 5 GOP, 2 DEM |
| 1970 | – | – | 5 GOP, 2 DEM |
| 1972 | Clark (D) | – | 3 DEM, 3 GOP |
| 1974 | – | Culver (D) | 5 DEM, 1 GOP |
| 1976 | – | – | 4 DEM, 2 GOP |
| 1978 | Jepsen (R) | – | 3 DEM, 3 GOP |
| 1980 | – | Grassley (R) | 3 DEM, 3 GOP |
| 1982 | – | – | 3 DEM, 3 GOP |
| 1984 | Harkin (D) | – | 4 GOP, 2 DEM |
| 1986 | – | Grassley (R) | 4 GOP, 2 DEM |
| 1988 | – | – | 4 GOP, 2 DEM |
| 1990 | Harkin (D) | – | 4 GOP, 2 DEM |
| 1992 | – | Grassley (R) | 4 GOP, 1 DEM |
| 1994 | – | – | 5 GOP |
| 1996 | Harkin (D) | – | 4 GOP, 1 DEM |
| 1998 | – | Grassley (R) | 4 GOP, 1 DEM |
| 2000 | – | – | 4 GOP, 1 DEM |
| 2002 | Harkin (D) | – | 4 GOP, 1 DEM |
| 2004 | – | Grassley (R) | 4 GOP, 1 DEM |
| 2006 | – | – | 3 DEM, 2 GOP |
| 2008 | Harkin (D) | – | 3 DEM, 2 GOP |
| 2010 | – | Grassley (R) | 3 DEM, 2 GOP |
| 2012 | – | – | 2 DEM, 2 GOP |
| 2014 | Ernst (R) | – | 3 GOP, 1 DEM |
| 2016 | – | Grassley (R) | 3 GOP, 1 DEM |
| 2018 | – | – | 3 DEM, 1 GOP |
| 2020 | Ernst (R) | – | 3 GOP, 1 DEM |
| 2022 | – | Grassley (R) | 4 GOP |
| Year | G | LG | SoS | AG | T | A | SA |
|---|
| 1846 | D | – | D | – | D | D | – |
| 1847 | D | – | D | – | D | D | – |
| 1848 | D | – | D | – | D | D | – |
| 1849 | D | – | D | – | D | D | – |
| 1850 | D | – | D | – | D | D | – |
| 1851 | D | – | D | – | D | D | – |
| 1852 | D | – | D | – | D | D | – |
| 1853 | D | – | D | D | D | D | – |
| 1854 | D | – | D | D | D | W | – |
| 1855 | W | – | D | D | D | R | – |
| 1856 | W | – | R | R | D | R | – |
| 1857 | W | – | R | R | D | R | – |
| 1858 | R | R | R | R | D | R | – |
| 1859 | R | R | R | R | R | R | – |
| 1860 | R | R | R | R | R | R | – |
| 1861 | R | R | R | R | R | R | – |
| 1862 | R | R | R | R | R | R | – |
| 1863 | R | R | R | R | R | R | – |
| 1864 | R | R | R | R | R | R | – |
| 1865 | R | R | R | R | R | R | – |
| 1866 | R | R | R | R | R | R | – |
| 1867 | R | R | R | R | R | R | – |
| 1868 | R | R | R | R | R | R | – |
| 1869 | R | R | R | R | R | R | – |
| 1870 | R | R | R | R | R | R | – |
| 1871 | R | R | R | R | R | R | – |
| 1872 | R | R | R | R | R | R | – |
| 1873 | R | R | R | R | R | R | – |
| 1874 | R | R | R | R | R | R | – |
| 1875 | R | R | R | R | R | R | – |
| 1876 | R | R | R | R | R | R | – |
| 1877 | R | R | R | R | R | R | – |
| 1878 | R | R | R | R | R | R | – |
| 1879 | R | R | R | R | R | R | – |
| 1880 | R | R | R | R | R | R | – |
| 1881 | R | R | R | R | R | R | – |
| 1882 | R | R | R | R | R | R | – |
| 1883 | R | R | R | R | R | R | – |
| 1884 | R | R | R | R | R | R | – |
| 1885 | R | R | R | R | R | R | – |
| 1886 | R | R | R | R | R | R | – |
| 1887 | R | R | R | R | R | R | – |
| 1888 | R | R | R | R | R | R | – |
| 1889 | R | R | R | R | R | R | – |
| 1890 | D | R | R | R | R | R | – |
| 1891 | D | R | R | R | R | R | – |
| 1892 | D | D | R | R | R | R | – |
| 1893 | D | D | R | R | R | R | – |
| 1894 | R | R | R | R | R | R | – |
| 1895 | R | R | R | R | R | R | – |
| 1896 | R | R | R | R | R | R | – |
| 1897 | R | R | R | R | R | R | – |
| 1898 | R | R | R | R | R | R | – |
| 1899 | R | R | R | R | R | R | – |
| 1900 | R | R | R | R | R | R | – |
| 1901 | R | R | R | R | R | R | – |
| 1902 | R | R | R | R | R | R | – |
| 1903 | R | R | R | R | R | R | – |
| 1904 | R | R | R | R | R | R | – |
| 1905 | R | R | R | R | R | R | – |
| 1906 | R | R | R | R | R | R | – |
| 1907 | R | R | R | R | R | R | – |
| 1908 | R | R | R | R | R | R | – |
| 1909 | R | R | R | R | R | R | – |
| 1910 | R | R | R | R | R | R | – |
| 1911 | R | R | R | R | R | R | – |
| 1912 | R | R | R | R | R | R | – |
| 1913 | R | R | R | R | R | R | – |
| 1914 | R | R | R | R | R | R | – |
| 1915 | R | R | R | R | R | R | – |
| 1916 | R | R | R | R | R | R | – |
| 1917 | R | R | R | R | R | R | – |
| 1918 | R | R | R | R | R | R | – |
| 1919 | R | R | R | R | R | R | – |
| 1920 | R | R | R | R | R | R | – |
| 1921 | R | R | R | R | R | R | – |
| 1922 | R | R | R | R | R | R | – |
| 1923 | R | R | R | R | R | R | R |
| 1924 | R | R | R | R | R | R | R |
| 1925 | R | R | R | R | R | R | R |
| 1926 | R | R | R | R | R | R | R |
| 1927 | R | R | R | R | R | R | R |
| 1928 | R | R | R | R | R | R | R |
| 1929 | R | R | R | R | R | R | R |
| 1930 | R | R | R | R | R | R | R |
| 1931 | R | R | R | R | R | R | R |
| 1932 | R | R | R | R | R | R | R |
| 1933 | D | D | D | D | D | D | D |
| 1934 | D | D | D | D | D | D | D |
| 1935 | D | D | D | D | D | D | D |
| 1936 | D | D | D | D | D | D | D |
| 1937 | D | D | D | D | D | D | D |
| 1938 | D | D | D | D | D | D | D |
| 1939 | R | R | R | R | R | R | R |
| 1940 | R | R | R | R | R | R | R |
| 1941 | R | R | R | R | R | R | R |
| 1942 | R | R | R | R | R | R | R |
| 1943 | R | R | R | R | R | R | R |
| 1944 | R | R | R | R | R | R | R |
| 1945 | R | R | R | R | R | R | R |
| 1946 | R | R | R | R | R | R | R |
| 1947 | R | R | R | R | R | R | R |
| 1948 | R | R | R | R | R | R | R |
| 1949 | R | R | R | R | R | R | R |
| 1950 | R | R | R | R | R | R | R |
| 1951 | R | R | R | R | R | R | R |
| 1952 | R | R | R | R | R | R | R |
| 1953 | R | R | R | R | R | R | R |
| 1954 | R | R | R | R | R | R | R |
| 1955 | R | R | R | R | R | R | R |
| 1956 | R | R | R | R | R | R | R |
| 1957 | D | R | R | R | R | R | R |
| 1958 | D | R | R | R | R | R | R |
| 1959 | D | D | R | R | R | R | R |
| 1960 | D | D | R | R | R | R | R |
| 1961 | R | R | R | R | R | R | R |
| 1962 | R | R | R | R | R | R | R |
| 1963 | D | R | R | R | R | R | R |
| 1964 | D | R | R | R | R | R | R |
| 1965 | D | D | D | D | D | D | D |
| 1966 | D | D | D | D | D | D | D |
| 1967 | D | D | R | R | D | R | R |
| 1968 | D | D | R | R | D | R | R |
| 1969 | R | R | R | R | R | R | R |
| 1970 | R | R | R | R | R | R | R |
| 1971 | R | R | R | R | R | R | R |
| 1972 | R | R | R | R | R | R | R |
| 1973 | R | R | R | R | R | R | R |
| 1974 | R | R | R | R | R | R | R |
| 1975 | R | R | R | R | R | R | R |
| 1976 | R | R | R | R | R | R | R |
| 1977 | R | R | R | R | R | R | R |
| 1978 | R | R | R | R | R | R | R |
| 1979 | R | R | R | D | R | R | R |
| 1980 | R | R | R | D | R | R | R |
| 1981 | R | R | R | D | R | R | R |
| 1982 | R | R | R | D | R | R | R |
| 1983 | R | D | R | D | D | R | R |
| 1984 | R | D | R | D | D | R | R |
| 1985 | R | D | R | D | D | R | R |
| 1986 | R | D | R | D | D | R | R |
| 1987 | R | D | D | D | D | R | D |
| 1988 | R | D | D | D | D | R | D |
| 1989 | R | D | D | D | D | R | D |
| 1990 | R | D | D | D | D | R | D |
| 1991 | R | R | D | D | D | R | D |
| 1992 | R | R | D | D | D | R | D |
| 1993 | R | R | D | D | D | R | D |
| 1994 | R | R | D | D | D | R | D |
| 1995 | R | R | R | D | D | R | D |
| 1996 | R | R | R | D | D | R | D |
| 1997 | R | R | R | D | D | R | D |
| 1998 | R | R | R | D | D | R | D |
| 1999 | D | D | D | D | D | R | D |
| 2000 | D | D | D | D | D | R | D |
| 2001 | D | D | D | D | D | R | D |
| 2002 | D | D | D | D | D | R | D |
| 2003 | D | D | D | D | D | R | D |
| 2004 | D | D | D | D | D | R | D |
| 2005 | D | D | D | D | D | R | D |
| 2006 | D | D | D | D | D | R | D |
| 2007 | D | D | D | D | D | R | R |
| 2008 | D | D | D | D | D | R | R |
| 2009 | D | D | D | D | D | R | R |
| 2010 | D | D | D | D | D | R | R |
| 2011 | R | R | R | D | D | R | R |
| 2012 | R | R | R | D | D | R | R |
| 2013 | R | R | R | D | D | R | R |
| 2014 | R | R | R | D | D | R | R |
| 2015 | R | R | R | D | D | R | R |
| 2016 | R | R | R | D | D | R | R |
| 2017 | R | R | R | D | D | R | R |
| 2018 | R | R | R | D | D | R | R |
| 2019 | R | R | R | D | D | D | R |
| 2020 | R | R | R | D | D | D | R |
| 2021 | R | R | R | D | D | D | R |
| 2022 | R | R | R | D | D | D | R |
| 2023 | R | R | R | R | R | D | R |
| Year | State Senate | State House |
|---|
| 1846 | 12 DEM, 6 Whig | 23 Whig, 17 DEM |
| 1847 | 12 DEM, 6 Whig | 23 Whig, 17 DEM |
| 1848 | 12 DEM, 6 Whig | 23 Whig, 17 DEM |
| 1849 | 11 DEM, 8 Whig | 28 DEM, 11 Whig |
| 1850 | 11 DEM, 8 Whig | 28 DEM, 11 Whig |
| 1851 | 13 DEM, 5 Whig | 34 DEM, 5 Whig |
| 1852 | 13 DEM, 5 Whig | 34 DEM, 5 Whig |
| 1853 | 20 DEM, 11 Whig | 40 DEM, 23 Whig |
| 1854 | 20 DEM, 11 Whig | 40 DEM, 23 Whig |
| 1855 | 17 DEM, 14 Whig | 40 Whig, 31 DEM |
| 1856 | 17 DEM, 14 Whig | 40 Whig, 31 DEM |
| 1857 | 23 GOP, 12 DEM | 44 GOP, 26 DEM |
| 1858 | 22 GOP, 14 DEM | 42 GOP, 30 DEM |
| 1859 | 22 GOP, 14 DEM | 42 GOP, 30 DEM |
| 1860 | 23 GOP, 20 DEM | 49 GOP, 37 DEM |
| 1861 | 23 GOP, 20 DEM | 49 GOP, 37 DEM |
| 1862 | 32 GOP, 14 DEM | 60 GOP, 34 DEM |
| 1863 | 32 GOP, 14 DEM | 60 GOP, 34 DEM |
| 1864 | 42 GOP, 4 DEM | 87 GOP, 5 DEM |
| 1865 | 42 GOP, 4 DEM | 87 GOP, 5 DEM |
| 1866 | 42 GOP, 5 DEM | 83 GOP, 15 DEM |
| 1867 | 42 GOP, 5 DEM | 83 GOP, 15 DEM |
| 1868 | 42 GOP, 7 DEM | 86 GOP, 14 DEM |
| 1869 | 42 GOP, 7 DEM | 86 GOP, 14 DEM |
| 1870 | 43 GOP, 7 DEM | 86 GOP, 14 DEM |
| 1871 | 43 GOP, 7 DEM | 86 GOP, 14 DEM |
| 1872 | 42 GOP, 8 DEM | 78 GOP, 22 DEM |
| 1873 | 42 GOP, 8 DEM | 78 GOP, 22 DEM |
| 1874 | 34 GOP, 10 IND, 6 DEM | 50 GOP, 44 IND, 6 DEM |
| 1875 | 34 GOP, 10 IND, 6 DEM | 50 GOP, 44 IND, 6 DEM |
| 1876 | 41 GOP, 9 DEM | 70 GOP, 30 DEM |
| 1877 | 41 GOP, 9 DEM | 70 GOP, 30 DEM |
| 1878 | 38 GOP, 12 DEM | 73 GOP, 25 DEM, 2 GB |
| 1879 | 38 GOP, 12 DEM | 73 GOP, 25 DEM, 2 GB |
| 1880 | 41 GOP, 7 DEM, 2 GB | 82 GOP, 14 DEM, 4 GB |
| 1881 | 41 GOP, 7 DEM, 2 GB | 82 GOP, 14 DEM, 4 GB |
| 1882 | 46 GOP, 2 DEM, 2 GB | 71 GOP, 22 DEM, 7 GB |
| 1883 | 46 GOP, 2 DEM, 2 GB | 71 GOP, 22 DEM, 7 GB |
| 1884 | 39 GOP, 11 DEM | 52 GOP, 42 DEM, 6 GB |
| 1885 | 39 GOP, 11 DEM | 52 GOP, 42 DEM, 6 GB |
| 1886 | 31 GOP, 19 DEM | 60 GOP, 39 DEM, 1 IND |
| 1887 | 31 GOP, 19 DEM | 60 GOP, 39 DEM, 1 IND |
| 1888 | 35 GOP, 15 DEM | 64 GOP, 33 DEM, 3 IND |
| 1889 | 35 GOP, 15 DEM | 64 GOP, 33 DEM, 3 IND |
| 1890 | 28 GOP, 20 DEM, 1 UL, 1 IND | 50 DEM, 45 GOP, 4 IND, 1 UL |
| 1891 | 28 GOP, 20 DEM, 1 UL, 1 IND | 50 DEM, 45 GOP, 4 IND, 1 UL |
| 1892 | 25 DEM, 24 GOP, 1 Pop. | 54 GOP, 45 DEM, 1 IND |
| 1893 | 25 DEM, 24 GOP, 1 Pop. | 54 GOP, 45 DEM, 1 IND |
| 1894 | 34 GOP, 16 DEM | 79 GOP, 21 DEM |
| 1895 | 34 GOP, 16 DEM | 79 GOP, 21 DEM |
| 1896 | 43 GOP, 7 DEM | 80 GOP, 20 DEM |
| 1897 | 43 GOP, 7 DEM | 80 GOP, 20 DEM |
| 1898 | 39 GOP, 11 DEM | 62 GOP, 38 DEM |
| 1899 | 39 GOP, 11 DEM | 62 GOP, 38 DEM |
| 1900 | 42 GOP, 8 DEM | 81 GOP, 19 DEM |
| 1901 | 42 GOP, 8 DEM | 81 GOP, 19 DEM |
| 1902 | 39 GOP, 11 DEM | 84 GOP, 16 DEM |
| 1903 | 39 GOP, 11 DEM | 84 GOP, 16 DEM |
| 1904 | 42 GOP, 8 DEM | 78 GOP, 22 DEM |
| 1905 | 42 GOP, 8 DEM | 78 GOP, 22 DEM |
| 1906 | 40 GOP, 10 DEM | 82 GOP, 18 DEM |
| 1907 | 36 GOP, 14 DEM | 75 GOP, 33 DEM |
| 1908 | 36 GOP, 14 DEM | 75 GOP, 33 DEM |
| 1909 | 34 GOP, 16 DEM | 80 GOP, 28 DEM |
| 1910 | 34 GOP, 16 DEM | 80 GOP, 28 DEM |
| 1911 | 34 GOP, 16 DEM | 70 GOP, 38 DEM |
| 1912 | 34 GOP, 16 DEM | 70 GOP, 38 DEM |
| 1913 | 33 GOP, 17 DEM | 66 GOP, 42 DEM |
| 1914 | 33 GOP, 17 DEM | 66 GOP, 42 DEM |
| 1915 | 35 GOP, 15 DEM | 76 GOP, 32 DEM |
| 1916 | 35 GOP, 15 DEM | 76 GOP, 32 DEM |
| 1917 | 40 GOP, 10 DEM | 94 GOP, 14 DEM |
| 1918 | 40 GOP, 10 DEM | 94 GOP, 14 DEM |
| 1919 | 45 GOP, 5 DEM | 93 GOP, 15 DEM |
| 1920 | 45 GOP, 5 DEM | 93 GOP, 15 DEM |
| 1921 | 48 GOP, 2 DEM | 101 GOP, 6 DEM, 1 IND |
| 1922 | 48 GOP, 2 DEM | 101 GOP, 6 DEM, 1 IND |
| 1923 | 46 GOP, 4 DEM | 91 GOP, 16 DEM, 1 IND |
| 1924 | 46 GOP, 4 DEM | 91 GOP, 16 DEM, 1 IND |
| 1925 | 45 GOP, 4 DEM, 1 IND | 101 GOP, 7 DEM |
| 1926 | 45 GOP, 4 DEM, 1 IND | 101 GOP, 7 DEM |
| 1927 | 48 GOP, 1 DEM, 1 IND DEM | 95 GOP, 13 DEM |
| 1928 | 48 GOP, 1 DEM, 1 IND DEM | 95 GOP, 13 DEM |
| 1929 | 48 GOP, 2 DEM | 96 GOP, 12 DEM |
| 1930 | 48 GOP, 2 DEM | 96 GOP, 12 DEM |
| 1931 | 44 GOP, 6 DEM | 71 GOP, 37 DEM |
| 1932 | 44 GOP, 6 DEM | 71 GOP, 37 DEM |
| 1933 | 25 DEM, 25 GOP | 76 DEM, 32 GOP |
| 1934 | 25 DEM, 25 GOP | 76 DEM, 32 GOP |
| 1935 | 28 DEM, 22 GOP | 58 DEM, 50 GOP |
| 1936 | 28 DEM, 22 GOP | 58 DEM, 50 GOP |
| 1937 | 28 DEM, 22 GOP | 54 DEM, 54 GOP |
| 1938 | 28 DEM, 22 GOP | 54 DEM, 54 GOP |
| 1939 | 38 GOP, 12 DEM | 89 GOP, 19 DEM |
| 1940 | 38 GOP, 12 DEM | 89 GOP, 19 DEM |
| 1941 | 45 GOP, 5 DEM | 87 GOP, 21 DEM |
| 1942 | 45 GOP, 5 DEM | 87 GOP, 21 DEM |
| 1943 | 45 GOP, 5 DEM | 98 GOP, 10 DEM |
| 1944 | 45 GOP, 5 DEM | 98 GOP, 10 DEM |
| 1945 | 45 GOP, 5 DEM | 91 GOP, 17 DEM |
| 1946 | 45 GOP, 5 DEM | 91 GOP, 17 DEM |
| 1947 | 44 GOP, 6 DEM | 98 GOP, 10 DEM |
| 1948 | 44 GOP, 6 DEM | 98 GOP, 10 DEM |
| 1949 | 43 GOP, 7 DEM | 79 GOP, 29 DEM |
| 1950 | 43 GOP, 7 DEM | 79 GOP, 29 DEM |
| 1951 | 41 GOP, 9 DEM | 93 GOP, 15 DEM |
| 1952 | 41 GOP, 9 DEM | 93 GOP, 15 DEM |
| 1953 | 46 GOP, 4 DEM | 105 GOP, 3 DEM |
| 1954 | 46 GOP, 4 DEM | 105 GOP, 3 DEM |
| 1955 | 44 GOP, 6 DEM | 90 GOP, 18 DEM |
| 1956 | 44 GOP, 6 DEM | 90 GOP, 18 DEM |
| 1957 | 40 GOP, 10 DEM | 71 GOP, 37 DEM |
| 1958 | 40 GOP, 10 DEM | 71 GOP, 37 DEM |
| 1959 | 33 GOP, 17 DEM | 58 GOP, 50 DEM |
| 1960 | 33 GOP, 17 DEM | 58 GOP, 50 DEM |
| 1961 | 35 GOP, 15 DEM | 78 GOP, 30 DEM |
| 1962 | 35 GOP, 15 DEM | 78 GOP, 30 DEM |
| 1963 | 38 GOP, 12 DEM | 78 GOP, 30 DEM |
| 1964 | 38 GOP, 12 DEM | 78 GOP, 30 DEM |
| 1965 | 34 DEM, 25 GOP | 101 DEM, 23 GOP |
| 1966 | 34 DEM, 25 GOP | 101 DEM, 23 GOP |
| 1967 | 32 DEM, 29 GOP | 89 GOP, 35 DEM |
| 1968 | 32 DEM, 29 GOP | 89 GOP, 35 DEM |
| 1969 | 44 GOP, 17 DEM | 86 GOP, 38 DEM |
| 1970 | 44 GOP, 17 DEM | 86 GOP, 38 DEM |
| 1971 | 38 GOP, 12 DEM | 63 GOP, 37 DEM |
| 1972 | 38 GOP, 12 DEM | 63 GOP, 37 DEM |
| 1973 | 28 GOP, 22 DEM | 57 GOP, 43 DEM |
| 1974 | 28 GOP, 22 DEM | 57 GOP, 43 DEM |
| 1975 | 26 DEM, 24 GOP | 61 DEM, 39 GOP |
| 1976 | 26 DEM, 24 GOP | 61 DEM, 39 GOP |
| 1977 | 26 DEM, 24 GOP | 59 DEM, 41 GOP |
| 1978 | 26 DEM, 24 GOP | 59 DEM, 41 GOP |
| 1979 | 28 GOP, 22 DEM | 57 GOP, 43 DEM |
| 1980 | 28 GOP, 22 DEM | 57 GOP, 43 DEM |
| 1981 | 29 GOP, 21 DEM | 58 GOP, 42 DEM |
| 1982 | 29 GOP, 21 DEM | 58 GOP, 42 DEM |
| 1983 | 28 DEM, 22 GOP | 60 DEM, 40 GOP |
| 1984 | 28 DEM, 22 GOP | 60 DEM, 40 GOP |
| 1985 | 29 DEM, 21 GOP | 60 DEM, 40 GOP |
| 1986 | 29 DEM, 21 GOP | 60 DEM, 40 GOP |
| 1987 | 30 DEM, 20 GOP | 58 DEM, 42 GOP |
| 1988 | 30 DEM, 20 GOP | 58 DEM, 42 GOP |
| 1989 | 30 DEM, 20 GOP | 61 DEM, 39 GOP |
| 1990 | 30 DEM, 20 GOP | 61 DEM, 39 GOP |
| 1991 | 28 DEM, 22 GOP | 53 DEM, 47 GOP |
| 1992 | 28 DEM, 22 GOP | 53 DEM, 47 GOP |
| 1993 | 26 DEM, 24 GOP | 51 GOP, 49 DEM |
| 1994 | 26 DEM, 24 GOP | 51 GOP, 49 DEM |
| 1995 | 27 DEM, 23 GOP | 64 GOP, 36 DEM |
| 1996 | 27 DEM, 23 GOP | 64 GOP, 36 DEM |
| 1997 | 29 GOP, 21 DEM | 54 GOP, 46 DEM |
| 1998 | 29 GOP, 21 DEM | 54 GOP, 46 DEM |
| 1999 | 30 GOP, 20 DEM | 56 GOP, 44 DEM |
| 2000 | 30 GOP, 20 DEM | 56 GOP, 44 DEM |
| 2001 | 30 GOP, 20 DEM | 56 GOP, 44 DEM |
| 2002 | 30 GOP, 20 DEM | 56 GOP, 44 DEM |
| 2003 | 29 GOP, 21 DEM | 54 GOP, 46 DEM |
| 2004 | 29 GOP, 21 DEM | 54 GOP, 46 DEM |
| 2005 | 25 DEM, 25 GOP | 51 GOP, 49 DEM |
| 2006 | 25 DEM, 25 GOP | 51 GOP, 49 DEM |
| 2007 | 30 DEM, 20 GOP | 54 DEM, 46 GOP |
| 2008 | 30 DEM, 20 GOP | 54 DEM, 46 GOP |
| 2009 | 32 DEM, 18 GOP | 57 DEM, 43 GOP |
| 2010 | 32 DEM, 18 GOP | 57 DEM, 43 GOP |
| 2011 | 26 DEM, 24 GOP | 60 GOP, 40 DEM |
| 2012 | 26 DEM, 24 GOP | 60 GOP, 40 DEM |
| 2013 | 26 DEM, 24 GOP | 53 GOP, 46 DEM, 1 vacant |
| 2014 | 26 DEM, 24 GOP | 53 GOP, 47 DEM |
| 2015 | 26 DEM, 24 GOP | 57 GOP, 43 DEM |
| 2016 | 26 DEM, 24 GOP | 57 GOP, 43 DEM |
| 2017 | 29 GOP, 20 DEM, 1 IND | 59 GOP, 41 DEM |
| 2018 | 29 GOP, 20 DEM, 1 IND | 59 GOP, 41 DEM |
| 2019 | 32 GOP, 18 DEM | 53 GOP, 47 DEM |
| 2020 | 32 GOP, 18 DEM | 53 GOP, 47 DEM |
| 2021 | 32 GOP, 18 DEM | 59 GOP, 41 DEM |
| 2022 | 32 GOP, 18 DEM | 60 GOP, 40 DEM |
| 2023 | 34 GOP, 16 DEM | 64 GOP, 36 DEM |
| 1848 (by county) |
1852 (by county) |
1856 (by county) |
1860 (by county) |
| 1864 (by county) |
1868 (by county) |
1872 (by county) |
1876 (by county) |
| 1880 (by county) |
1884 (by county) |
1888 (by county) |
1892 (by county) |
| 1896 (by county) |
1900 (by county) |
1904 (by county) |
1908 (by county) |
| 1912 (by county) |
1916 (by county) |
1920 (by county) |
1924 (by county) |
| 1928 (by county) |
1932 (by county) |
1936 (by county) |
1940 (by county) |
| 1944 (by county) |
1948 (by county) |
1952 (by county) |
1956 (by county) |
| 1960 (by county) |
1964 (by county) |
1968 (by county) |
1972 (by county) |
| 1976 (by county) |
1980 (by county) |
1984 (by county) |
1988 (by county) |
| 1992 (by county) |
1996 (by county) |
2000 (by county) |
2004 (by county) |
| 2008 (by county) |
2012 (by county) |
2016 (by county) |
2020 (by county) |
| 1914 (by county) |
1918 (by county) |
1920 (by county) |
1924 (by county) |
| 1926 (by county) |
1930 (by county) |
1932 (by county) |
1936 (by county) |
| 1938 (by county) |
1942 (by county) |
1944 (by county) |
1948 (by county) |
| 1950 (by county) |
1954 (by county) |
1956 (by county) |
1960 (by county) |
| 1962 (by county) |
1966 (by county) |
1968 (by county) |
1972 (by county) |
| 1974 (by county) |
1978 (by county) |
1980 (by county) |
1984 (by county) |
| 1986 (by county) |
1990 (by county) |
1992 (by county) |
1996 (by county) |
| 1998 (by county) |
2002 (by county) |
2004 (by county) |
2008 (by county) |
| 2010 (by county) |
2014 (by county) |
2016 (by county) |
2020 (by county) |
| 2022 (by county) |
| 1846 |
1848 |
1850 |
1852 |
1854 |
1856 |
1858 |
1860 |
1862 |
1864 |
| 1866 |
1868 |
1870 |
1872 |
1874 |
1876 |
1878 |
1880 |
1882 |
1884 |
| 1886 |
1888 |
1890 |
1892 |
1894 |
1896 |
1898 |
1900 |
1902 |
1904 |
| 1906 |
1908 |
1910 |
1912 |
1914 |
1916 |
1918 |
1920 |
1922 |
1924 |
| 1926 |
1928 |
1930 |
1932 |
1934 |
1936 |
1938 |
1940 |
1942 |
1944 |
| 1946 |
1948 |
1950 |
1952 |
1954 |
1956 |
1958 |
1960 |
1962 |
1964 |
| 1966 |
1968 |
1970 |
1972 |
1974 |
1976 |
1978 |
1980 |
1982 |
1984 |
| 1986 |
1988 |
1990 |
1992 |
1994 |
1996 |
1998 |
2000 |
2002 |
2004 |
| 2006 |
2008 |
2010 |
2012 |
2014 |
2016 |
2018 |
2020 |
2022 |
| 1846 (by county) |
1850 (by county) |
1854 (by county) |
1857 (by county) |
| 1859 (by county) |
1861 (by county) |
1863 (by county) |
1865 (by county) |
| 1867 (by county) |
1869 (by county) |
1871 (by county) |
1873 (by county) |
| 1875 (by county) |
1877 (by county) |
1879 (by county) |
1881 (by county) |
| 1883 (by county) |
1885 (by county) |
1887 (by county) |
1889 (by county) |
| 1891 (by county) |
1893 (by county) |
1895 (by county) |
1897 (by county) |
| 1899 (by county) |
1901 (by county) |
1903 (by county) |
1906 (by county) |
| 1908 (by county) |
1910 (by county) |
1912 (by county) |
1914 (by county) |
| 1916 (by county) |
1918 (by county) |
1920 (by county) |
1922 (by county) |
| 1924 (by county) |
1926 (by county) |
1928 (by county) |
1930 (by county) |
| 1932 (by county) |
1934 (by county) |
1936 (by county) |
1938 (by county) |
| 1940 (by county) |
1942 (by county) |
1944 (by county) |
1946 (by county) |
| 1948 (by county) |
1950 (by county) |
1952 (by county) |
1954 (by county) |
| 1956 (by county) |
1958 (by county) |
1960 (by county) |
1962 (by county) |
| 1964 (by county) |
1966 (by county) |
1968 (by county) |
1970 (by county) |
| 1972 (by county) |
1974 (by county) |
1978 (by county) |
1982 (by county) |
| 1986 (by county) |
1990 (by county) |
1994 (by county) |
1998 (by county) |
| 2002 (by county) |
2006 (by county) |
2010 (by county) |
2014 (by county) |
| 2018 (by county) |
2022 (by county) |
| 1857 (by county) |
1859 (by county) |
1861 (by county) |
1863 (by county) |
| 1865 (by county) |
1867 (by county) |
1869 (by county) |
1871 (by county) |
| 1873 (by county) |
1875 (by county) |
1877 (by county) |
1879 (by county) |
| 1881 (by county) |
1883 (by county) |
1885 (by county) |
1887 (by county) |
| 1889 (by county) |
1891 (by county) |
1893 (by county) |
1895 (by county) |
| 1897 (by county) |
1899 (by county) |
1901 (by county) |
1903 (by county) |
| 1906 (by county) |
1908 (by county) |
1910 (by county) |
1912 (by county) |
| 1914 (by county) |
1916 (by county) |
1918 (by county) |
1920 (by county) |
| 1922 (by county) |
1924 (by county) |
1926 (by county) |
1928 (by county) |
| 1930 (by county) |
1932 (by county) |
1934 (by county) |
1936 (by county) |
| 1938 (by county) |
1940 (by county) |
1942 (by county) |
1944 (by county) |
| 1946 (by county) |
1948 (by county) |
1950 (by county) |
1952 (by county) |
| 1954 (by county) |
1956 (by county) |
1958 (by county) |
1960 (by county) |
| 1962 (by county) |
1964 (by county) |
1966 (by county) |
1968 (by county) |
| 1970 (by county) |
1972 (by county) |
1974 (by county) |
1978 (by county) |
| 1982 (by county) |
1986 (by county) |
| 1846 (by county) |
1850 (by county) |
1854 (by county) |
1857 (by county) |
| 1859 (by county) |
1861 (by county) |
1863 (by county) |
1865 (by county) |
| 1867 (by county) |
1869 (by county) |
1871 (by county) |
1873 (by county) |
| 1875 (by county) |
1877 (by county) |
1879 (by county) |
1881 (by county) |
| 1883 (by county) |
1885 (by county) |
1887 (by county) |
1889 (by county) |
| 1891 (by county) |
1893 (by county) |
1895 (by county) |
1897 (by county) |
| 1899 (by county) |
1901 (by county) |
1903 (by county) |
1906 (by county) |
| 1908 (by county) |
1910 (by county) |
1912 (by county) |
1914 (by county) |
| 1916 (by county) |
1918 (by county) |
1920 (by county) |
1922 (by county) |
| 1924 (by county) |
1926 (by county) |
1928 (by county) |
1930 (by county) |
| 1932 (by county) |
1934 (by county) |
1936 (by county) |
1938 (by county) |
| 1940 (by county) |
1942 (by county) |
1944 (by county) |
1946 (by county) |
| 1948 (by county) |
1950 (by county) |
1952 (by county) |
1954 (by county) |
| 1956 (by county) |
1958 (by county) |
1960 (by county) |
1962 (by county) |
| 1964 (by county) |
1966 (by county) |
1968 (by county) |
1970 (by county) |
| 1972 (by county) |
1974 (by county) |
1978 (by county) |
1982 (by county) |
| 1986 (by county) |
1990 (by county) |
1994 (by county) |
1998 (by county) |
| 2002 (by county) |
2006 (by county) |
2010 (by county) |
2014 (by county) |
| 2018 (by county) |
2022 (by county) |
| 1854 (by county) |
1857 (by county) |
1859 (by county) |
1861 (by county) |
| 1863 (by county) |
1865 (by county) |
1867 (by county) |
1869 (by county) |
| 1871 (by county) |
1873 (by county) |
1875 (by county) |
1877 (by county) |
| 1879 (by county) |
1881 (by county) |
1883 (by county) |
1885 (by county) |
| 1887 (by county) |
1889 (by county) |
1891 (by county) |
1893 (by county) |
| 1895 (by county) |
1897 (by county) |
1899 (by county) |
1901 (by county) |
| 1903 (by county) |
1906 (by county) |
1908 (by county) |
1910 (by county) |
| 1912 (by county) |
1914 (by county) |
1916 (by county) |
1918 (by county) |
| 1920 (by county) |
1922 (by county) |
1924 (by county) |
1926 (by county) |
| 1928 (by county) |
1930 (by county) |
1932 (by county) |
1934 (by county) |
| 1936 (by county) |
1938 (by county) |
1940 (by county) |
1942 (by county) |
| 1944 (by county) |
1946 (by county) |
1948 (by county) |
1950 (by county) |
| 1952 (by county) |
1954 (by county) |
1956 (by county) |
1958 (by county) |
| 1960 (by county) |
1962 (by county) |
1964 (by county) |
1966 (by county) |
| 1968 (by county) |
1970 (by county) |
1972 (by county) |
1974 (by county) |
| 1978 (by county) |
1982 (by county) |
1986 (by county) |
1990 (by county) |
| 1994 (by county) |
1998 (by county) |
2002 (by county) |
2006 (by county) |
| 2010 (by county) |
2014 (by county) |
2018 (by county) |
2022 (by county) |
| 1846 (by county) |
1850 (by county) |
1854 (by county) |
1857 (by county) |
| 1859 (by county) |
1861 (by county) |
1863 (by county) |
1865 (by county) |
| 1867 (by county) |
1869 (by county) |
1871 (by county) |
1873 (by county) |
| 1875 (by county) |
1877 (by county) |
1879 (by county) |
1881 (by county) |
| 1883 (by county) |
1885 (by county) |
1887 (by county) |
1889 (by county) |
| 1891 (by county) |
1893 (by county) |
1895 (by county) |
1897 (by county) |
| 1899 (by county) |
1901 (by county) |
1903 (by county) |
1906 (by county) |
| 1908 (by county) |
1910 (by county) |
1912 (by county) |
1914 (by county) |
| 1916 (by county) |
1918 (by county) |
1920 (by county) |
1922 (by county) |
| 1924 (by county) |
1926 (by county) |
1928 (by county) |
1930 (by county) |
| 1932 (by county) |
1934 (by county) |
1936 (by county) |
1938 (by county) |
| 1940 (by county) |
1942 (by county) |
1944 (by county) |
1946 (by county) |
| 1948 (by county) |
1950 (by county) |
1952 (by county) |
1954 (by county) |
| 1956 (by county) |
1958 (by county) |
1960 (by county) |
1962 (by county) |
| 1964 (by county) |
1966 (by county) |
1968 (by county) |
1970 (by county) |
| 1972 (by county) |
1974 (by county) |
1978 (by county) |
1982 (by county) |
| 1986 (by county) |
1990 (by county) |
1994 (by county) |
1998 (by county) |
| 2002 (by county) |
2006 (by county) |
2010 (by county) |
2014 (by county) |
| 2018 (by county) |
2022 (by county) |
| 1846 (by county) |
1850 (by county) |
1854 (by county) |
1857 (by county) |
| 1859 (by county) |
1861 (by county) |
1863 (by county) |
1865 (by county) |
| 1867 (by county) |
1869 (by county) |
1871 (by county) |
1873 (by county) |
| 1875 (by county) |
1877 (by county) |
1879 (by county) |
1881 (by county) |
| 1883 (by county) |
1885 (by county) |
1887 (by county) |
1889 (by county) |
| 1891 (by county) |
1893 (by county) |
1895 (by county) |
1897 (by county) |
| 1899 (by county) |
1901 (by county) |
1903 (by county) |
1906 (by county) |
| 1908 (by county) |
1910 (by county) |
1912 (by county) |
1914 (by county) |
| 1916 (by county) |
1918 (by county) |
1920 (by county) |
1922 (by county) |
| 1924 (by county) |
1926 (by county) |
1928 (by county) |
1930 (by county) |
| 1932 (by county) |
1934 (by county) |
1936 (by county) |
1938 (by county) |
| 1940 (by county) |
1942 (by county) |
1944 (by county) |
1946 (by county) |
| 1948 (by county) |
1950 (by county) |
1952 (by county) |
1954 (by county) |
| 1956 (by county) |
1958 (by county) |
1960 (by county) |
1962 (by county) |
| 1964 (by county) |
1966 (by county) |
1968 (by county) |
1970 (by county) |
| 1972 (by county) |
1974 (by county) |
1978 (by county) |
1982 (by county) |
| 1986 (by county) |
1990 (by county) |
1994 (by county) |
1998 (by county) |
| 2002 (by county) |
2006 (by county) |
2010 (by county) |
2014 (by county) |
| 2018 (by county) |
2022 (by county) |
| 1924 (by county) |
1926 (by county) |
1928 (by county) |
1930 (by county) |
| 1932 (by county) |
1934 (by county) |
1936 (by county) |
1938 (by county) |
| 1940 (by county) |
1942 (by county) |
1944 (by county) |
1946 (by county) |
| 1948 (by county) |
1950 (by county) |
1952 (by county) |
1954 (by county) |
| 1956 (by county) |
1958 (by county) |
1960 (by county) |
1962 (by county) |
| 1964 (by county) |
1966 (by county) |
1968 (by county) |
1970 (by county) |
| 1972 (by county) |
1974 (by county) |
1978 (by county) |
1982 (by county) |
| 1986 (by county) |
1990 (by county) |
1994 (by county) |
1998 (by county) |
| 2002 (by county) |
2006 (by county) |
2010 (by county) |
2014 (by county) |
| 2018 (by county) |
2022 (by county) |
Source
General Election Results – Iowa. United States Election Atlas.
Party Affiliations in the State Legislatures: A Year by Year Summary, 1796-2006 [Michael J. Dubin]
