Composition of Congress by Political Party, 1855–2007

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		Senate					House
Congress	Years	Total	Dems	Reps	Others	Vacant	Total	Dems	Reps	Others	Vacant
34th	1855-1857	62	42	15	5	0	234	83	108	43	0
35th	1857-1859	64	39	20	5	0	237	131	92	14	0
36th	1859-1861	66	38	26	2	0	237	101	113	23	0
37th	1861-1863	50	11	31	7	1	178	42	106	28	2
38th	1863-1865	51	12	39	0	0	183	80	103	0	0
39th	1865-1867	52	10	42	0	0	191	46	145	0	0
40th	1867-1869	53	11	42	0	0	193	49	143	0	1
41st	1869-1871	74	11	61	0	2	243	73	170	0	0
42nd	1871-1873	74	17	57	0	0	243	104	139	0	0
43rd	1873-1875	74	19	54	0	1	293	88	203	0	2
44th	1875-1877	76	29	46	0	1	293	181	107	3	2
45th	1877-1879	76	36	39	1	0	293	156	137	0	0
46th	1879-1881	76	43	33	0	0	293	150	128	14	1
47th	1881-1883	76	37	37	2	0	293	130	152	11	0
48th	1883-1885	76	36	40	0	0	325	200	119	6	0
49th	1885-1887	76	34	41	0	1	325	182	140	2	1
50th	1887-1889	76	37	39	0	0	325	170	151	4	0
51st	1889-1891	84	37	47	0	0	330	156	173	1	0
52nd	1891-1893	88	39	47	2	0	333	231	88	14	0
53rd	1893-1895	88	44	38	3	3	356	220	126	10	0
54th	1895-1897	88	39	44	5	0	357	104	246	7	0
55th	1897-1899	90	34	46	10	0	357	134	206	16	1
56th	1899-1901	90	26	53	11	0	357	163	185	9	0
57th	1901-1903	90	29	56	3	2	357	153	198	5	1
58th	1903-1905	90	32	58	0	0	386	178	207	0	1
59th	1905-1907	90	32	58	0	0	386	136	250	0	0
60th	1907-1909	92	29	61	0	2	386	164	222	0	0
61st	1909-1911	92	32	59	0	1	391	172	219	0	0
62nd	1911-1913	92	42	49	0	1	391	228	162	1	0
63rd	1913-1915	96	51	44	1	0	435	290	127	18	0
64th	1915-1917	96	56	39	1	0	435	231	193	8	3
65th	1917-1919	96	53	42	1	0	435	210¹	216	9	0
66th	1919-1921	96	47	48	1	0	435	191	237	7	0
67th	1921-1923	96	37	59	0	0	435	132	300	1	2
68th	1923-1925	96	43	51	2	0	435	207	225	3	0
69th	1925-1927	96	40	54	1	1	435	183	247	5	0
70th	1927-1929	96	47	48	1	0	435	195	237	3	0
71st	1929-1931	96	39	56	1	0	435	163	267	1	4
72nd	1931-1933	96	47	48	1	0	435	216²	218	1	0
73rd	1933-1935	96	59	36	1	0	435	313	117	5	0
74th	1935-1937	96	69	25	2	0	435	322	103	10	0
75th	1937-1939	96	75	17	4	0	435	333	89	13	0
76th	1939-1941	96	69	23	4	0	435	262	169	4	0
77th	1941-1943	96	66	28	2	0	435	267	162	6	0
78th	1943-1945	96	57	38	1	0	435	222	209	4	0
79th	1945-1947	96	57	38	1	0	435	243	190	2	0
80th	1947-1949	96	45	51	0	0	435	188	246	1	0
81st	1949-1951	96	54	42	0	0	435	263	171	1	0
82nd	1951-1953	96	48	47	1	0	435	234	199	2	0
83rd	1953-1955	96	46	48	2	0	435	213	221	1	0
84th	1955-1957	96	48	47	1	0	435	232	203	0	0
85th	1957-1959	96	49	47	0	0	435	234	201	0	0
86th	1959-1961	98	64	34	0	0	436³	283	153	0	0
87th	1961-1963	100	64	36	0	0	437⁴	262	175	0	0
88th	1963-1965	100	67	33	0	0	435	258	176	0	1
89th	1965-1967	100	68	32	0	0	435	295	140	0	0
90th	1967-1969	100	64	36	0	0	435	248	187	0	0
91st	1969-1971	100	58	42	0	0	435	243	192	0	0
92nd	1971-1973	100	54	44	2	0	435	255	180	0	0
93rd	1973-1975	100	56	42	2	0	435	242	192	1	0
94th	1975-1977	100	61	37	2	0	435	291	144	0	0
95th	1977-1979	100	61	38	1	0	435	292	143	0	0
96th	1979-1981	100	58	41	1	0	435	277	158	0	0
97th	1981-1983	100	46	53	1	0	435	242	192	1	0
98th	1983-1985	100	46	54	0	0	435	269	166	0	0
99th	1985-1987	100	47	53	0	0	435	253	182	0	0
100th	1987-1989	100	55	45	0	0	435	258	177	0	0
101st	1989-1991	100	55	45	0	0	435	260	175	0	0
102nd	1991-1993	100	56	44	0	0	435	267	167	1	0
103rd	1993-1995	100	57	43	0	0	435	258	176	1	0
104th	1995-1997	100	48	52	0	0	435	204	230	1	0
105th	1997-1999	100	45	55	0	0	435	207	226	2	0
106th	1999-2001	100	45	55	0	0	435	211	223	1	0
107th	2001-2003	100	50	50	0	0	435	212	221	2	0
108th	2003-2005	100	48	51	1	0	435	205	229	1	0
109th	2005-2007	100	44	55	1	0	435	202	231	1	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 3 January 1959.
4. Proclamation declaring Hawaii a state issued 21 August 1959.
Source: Office of the Clerk of the House of Representatives: http://clerkweb.house.gov/histrecs/history.htm

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