Composition of Congress, by Political Party, 1855–2017

Here is a breakdown of the composition of Congress by political party from 1855 to the present.

    Senate House
Congress Years Total Dems Reps Others Vacant Total Dems Reps Others Vacant
34th 1855–1857 62 42 15 5 - 234 83 108 43 -
35th 1857–1859 64 39 20 5 - 237 131 92 14 -
36th 1859–1861 66 38 26 2 - 237 101 113 23 -
37th 1861–1863 50 11 31 7 1 178 42 106 28 2
38th 1863–1865 51 12 39 - - 183 80 103 - -
39th 1865–1867 52 10 42 - - 191 46 145 - -
40th 1867–1869 53 11 42 - - 193 49 143 - 1
41st 1869–1871 74 11 61 - 2 243 73 170 - -
42nd 1871–1873 74 17 57 - - 243 104 139 - -
43rd 1873–1875 74 19 54 - 1 293 88 203 - 2
44th 1875–1877 76 29 46 - 1 293 181 107 3 2
45th 1877–1879 76 36 39 1 - 293 156 137 - -
46th 1879–1881 76 43 33 - - 293 150 128 14 1
47th 1881–1883 76 37 37 2 - 293 130 152 11 -
48th 1883–1885 76 36 40 - - 325 200 119 6 -
49th 1885–1887 76 34 41 - 1 325 182 140 2 1
50th 1887–1889 76 37 39 - - 325 170 151 4 -
51st 1889–1891 84 37 47 - - 330 156 173 1 -
52nd 1891–1893 88 39 47 2 - 333 231 88 14 -
53rd 1893–1895 88 44 38 3 3 356 220 126 10 -
54th 1895–1897 88 39 44 5 - 357 104 246 7 -
55th 1897–1899 90 34 46 10 - 357 134 206 16 1
56th 1899–1901 90 26 53 11 - 357 163 185 9 -
57th 1901–1903 90 29 56 3 2 357 153 198 5 1
58th 1903–1905 90 32 58 - - 386 178 207 - 1
59th 1905–1907 90 32 58 - - 386 136 250 - -
60th 1907–1909 92 29 61 - 2 386 164 222 - -
61st 1909–1911 92 32 59 - 1 391 172 219 - -
62nd 1911–1913 92 42 49 - 1 391 228 162 1 -
63rd 1913–1915 96 51 44 1 - 435 290 127 18 -
64th 1915–1917 96 56 39 1 - 435 231 193 8 3
65th 1917–1919 96 53 42 1 - 435 2101 216 9 -
66th 1919–1921 96 47 48 1 - 435 191 237 7 -
67th 1921–1923 96 37 59 - - 435 132 300 1 2
68th 1923–1925 96 43 51 2 - 435 207 225 3 -
69th 1925–1927 96 40 54 1 1 435 183 247 5 -
70th 1927–1929 96 47 48 1 - 435 195 237 3 -
71st 1929–1931 96 39 56 1 - 435 163 267 1 4
72nd 1931–1933 96 47 48 1 - 435 2162 218 1 -
73rd 1933–1935 96 59 36 1 - 435 313 117 5 -
74th 1935–1937 96 69 25 2 - 435 322 103 10 -
75th 1937–1939 96 75 17 4 - 435 333 89 13 -
76th 1939–1941 96 69 23 4 - 435 262 169 4 -
77th 1941–1943 96 66 28 2 - 435 267 162 6 -
78th 1943–1945 96 57 38 1 - 435 222 209 4 -
79th 1945–1947 96 57 38 1 - 435 243 190 2 -
80th 1947–1949 96 45 51 - - 435 188 246 1 -
81st 1949–1951 96 54 42 - - 435 263 171 1 -
82nd 1951–1953 96 48 47 1 - 435 234 199 2 -
83rd 1953–1955 96 46 48 2 - 435 213 221 1 -
84th 1955–1957 96 48 47 1 - 435 232 203 - -
85th 1957–1959 96 49 47 - - 435 234 201 - -
86th 1959–1961 98 64 34 - - 4363 283 153 - -
87th 1961–1963 100 64 36 - - 4374 262 175 - -
88th 1963–1965 100 67 33 - - 435 258 176 - 1
89th 1965–1967 100 68 32 - - 435 295 140 - -
90th 1967–1969 100 64 36 - - 435 248 187 - -
91st 1969–1971 100 58 42 - - 435 243 192 - -
92nd 1971–1973 100 54 44 2 - 435 255 180 - -
93rd 1973–1975 100 56 42 2 - 435 242 192 1 -
94th 1975–1977 100 61 37 2 - 435 291 144 - -
95th 1977–1979 100 61 38 1 - 435 292 143 - -
96th 1979–1981 100 58 41 1 - 435 277 158 - -
97th 1981–1983 100 46 53 1 - 435 242 192 1 -
98th 1983–1985 100 46 54 - - 435 269 166 - -
99th 1985–1987 100 47 53 - - 435 253 182 - -
100th 1987–1989 100 55 45 - - 435 258 177 - -
101st 1989–1991 100 55 45 - - 435 260 175 - -
102nd 1991–1993 100 56 44 - - 435 267 167 1 -
103rd 1993–1995 100 57 43 - - 435 258 176 1 -
104th 1995–1997 100 48 52 - - 435 204 230 1 -
105th 1997–1999 100 45 55 - - 435 207 226 2 -
106th 1999–2001 100 45 55 - - 435 211 223 1 -
107th 2001–2003 100 50 50 - - 435 212 221 2 -
108th 2003–2005 100 48 51 1 - 435 205 229 1 -
109th 2005–2007 100 44 55 1 - 435 202 231 1 1
110th 2007–2009 100 49 49 2 - 435 233 198 - 4
111th 2009–2011 100 57 41 2 2 435 256 178 - 1
112th 2011–2013 100 51 47 2 435 193 242 - -
113th 2013–2015 100 54 45 1 435 201 234 -
114th 2015–2017 100 44 54 2 435 188 246 1
NOTE: All figures reflect immediate results of elections.
1. Democrats organized House with help of other parties.
2. Democrats organized House due to Republican deaths.
3. Proclamation declaring Alaska a state issued Jan 3., 1959.
4. Proclamation declaring Hawaii a state issued Aug. 21, 1959.
Source: Office of the Clerk of the House of Representatives.