Composition of Congress, by Political Party, 1855-2017

Updated June 18, 2019 | Infoplease Staff

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