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.

SenateHouse
CongressYearsTotalDemsRepsOthersVacantTotalDemsRepsOthersVacant
34th1855-18576242155-2348310843-
35th1857-18596439205-2371319214-
36th1859-18616638262-23710111323-
37th1861-18635011317117842106282
38th1863-1865511239--18380103--
39th1865-1867521042--19146145--
40th1867-1869531142--19349143-1
41st1869-1871741161-224373170--
42nd1871-1873741757--243104139--
43rd1873-1875741954-129388203-2
44th1875-1877762946-129318110732
45th1877-18797636391-293156137--
46th1879-1881764333--293150128141
47th1881-18837637372-29313015211-
48th1883-1885763640--3252001196-
49th1885-1887763441-132518214021
50th1887-1889763739--3251701514-
51st1889-1891843747--3301561731-
52nd1891-18938839472-3332318814-
53rd1893-18958844383335622012610-
54th1895-18978839445-3571042467-
55th1897-189990344610-357134206161
56th1899-190190265311-3571631859-
57th1901-19039029563235715319851
58th1903-1905903258--386178207-1
59th1905-1907903258--386136250--
60th1907-1909922961-2386164222--
61st1909-1911923259-1391172219--
62nd1911-1913924249-13912281621-
63rd1913-19159651441-43529012718-
64th1915-19179656391-43523119383
65th1917-19199653421-43521012169-
66th1919-19219647481-4351912377-
67th1921-1923963759--43513230012
68th1923-19259643512-4352072253-
69th1925-1927964054114351832475-
70th1927-19299647481-4351952373-
71st1929-19319639561-43516326714
72nd1931-19339647481-43521622181-
73rd1933-19359659361-4353131175-
74th1935-19379669252-43532210310-
75th1937-19399675174-4353338913-
76th1939-19419669234-4352621694-
77th1941-19439666282-4352671626-
78th1943-19459657381-4352222094-
79th1945-19479657381-4352431902-
80th1947-1949964551--4351882461-
81st1949-1951965442--4352631711-
82nd1951-19539648471-4352341992-
83rd1953-19559646482-4352132211-
84th1955-19579648471-435232203--
85th1957-1959964947--435234201--
86th1959-1961986434--4363283153--
87th1961-19631006436--4374262175--
88th1963-19651006733--435258176-1
89th1965-19671006832--435295140--
90th1967-19691006436--435248187--
91st1969-19711005842--435243192--
92nd1971-197310054442-435255180--
93rd1973-197510056422-4352421921-
94th1975-197710061372-435291144--
95th1977-197910061381-435292143--
96th1979-198110058411-435277158--
97th1981-198310046531-4352421921-
98th1983-19851004654--435269166--
99th1985-19871004753--435253182--
100th1987-19891005545--435258177--
101st1989-19911005545--435260175--
102nd1991-19931005644--4352671671-
103rd1993-19951005743--4352581761-
104th1995-19971004852--4352042301-
105th1997-19991004555--4352072262-
106th1999-20011004555--4352112231-
107th2001-20031005050--4352122212-
108th2003-200510048511-4352052291-
109th2005-200710044551-43520223111
110th2007-200910049492-435233198-4
111th2009-2011100574122435256178-1
112th2011-201310051472435193242--
113th2013-201510054451435201234-
114th2015–2017100445424351882461
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.