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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.