Seats By Party
| Cycle | Republican Seats | Democratic Seats |
|---|---|---|
| 2024 | 34 | 15 |
| 2022 | 34 | 16 |
| 2020 | 32 | 18 |
| 2018 | 32 | 18 |
| 2016 | 29 | 20 |
| 2014 | 24 | 26 |
| 2012 | 24 | 26 |
| 2010 | 22 | 26 |
| 2008 | 18 | 32 |
| 2006 | 20 | 30 |
| 2004 | 25 | 25 |
| 2002 | 29 | 21 |
| 2000 | 30 | 20 |
| 1998 | 30 | 20 |
| 1996 | 29 | 21 |
| 1994 | 23 | 27 |
| 1992 | 23 | 27 |
| 1990 | 22 | 27 |
| 1988 | 20 | 30 |
| 1986 | 20 | 30 |
| 1984 | 21 | 29 |
| 1982 | 22 | 28 |
| 1980 | 29 | 21 |
| 1978 | 28 | 22 |
| 1976 | 24 | 26 |
| 1974 | 24 | 26 |
| 1972 | 28 | 22 |
| 1970 | 38 | 12 |
| 1968 | 45 | 16 |
| 1966 | 29 | 32 |
| 1964 | 25 | 34 |
| 1962 | 38 | 12 |
| 1960 | 35 | 15 |
| 1958 | 33 | 17 |
| 1956 | 40 | 10 |
| 1954 | 44 | 6 |
| 1952 | 46 | 4 |
| 1950 | 41 | 9 |
| 1948 | 43 | 7 |
| 1946 | 46 | 4 |
| 1944 | 44 | 5 |
| 1942 | 45 | 5 |
| 1940 | 45 | 5 |
| 1938 | 38 | 11 |
| 1936 | 28 | 22 |
| 1934 | 22 | 28 |
| 1932 | 25 | 26 |
| 1930 | 44 | 6 |
| 1928 | 48 | 2 |
| 1926 | 49 | 1 |
| 1924 | 45 | 4 |
| 1922 | 47 | 4 |
| 1920 | 48 | 2 |
| 1918 | 45 | 5 |
| 1916 | 40 | 10 |
| 1914 | 35 | 15 |
| 1912 | 32 | 18 |
| 1910 | 34 | 16 |
| 1908 | 34 | 16 |
| 1906 | 36 | 14 |
| 1905 | 42 | 8 |
| 1903 | 42 | 8 |
| 1901 | 40 | 11 |
| 1899 | 35 | 15 |
| 1897 | 39 | 11 |
| 1895 | 43 | 7 |
| 1893 | 34 | 16 |
| 1891 | 24 | 25 |
| 1889 | 28 | 20 |
| 1887 | 32 | 16 |
| 1885 | 31 | 19 |
| 1883 | 39 | 11 |
| 1881 | 45 | 2 |
| 1879 | 41 | 7 |
| 1877 | 38 | 12 |
| 1875 | 41 | 9 |
| 1873 | 34 | 8 |
| 1871 | 42 | 8 |
| 1869 | 42 | 7 |
| 1867 | 40 | 8 |
| 1865 | 42 | 6 |
| 1863 | 41 | 5 |
| 1861 | 33 | 18 |
| 1859 | 23 | 20 |
| 1857 | 22 | 14 |
| 1855 | 23 | 12 |
| 1853 | 0 | 16 |
| 1851 | 0 | 20 |
| 1849 | 0 | 14 |
| 1847 | 0 | 11 |
| 1845 | 0 | 11 |
| 1844 | 0 | 22 |
| 1842 | 0 | 6 |
| 1841 | 0 | 6 |
| 1840 | 0 | 7 |
| 1839 | 0 | 6 |
| 1838 | 0 | 7 |
| 1837 | 0 | 7 |
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