Partisan Breakdown of Seats in Congress

		Seat Allocation			Share of Total (%)²
Year¹	Total	Republican	Democrat	Other	Republican	Democrat	Other

1900	356	198	153	5	55.6	43.0	1.4
1902	385	207	178	0	53.8	46.2	0.0
1904	386	250	136	0	64.8	35.2	0.0
1906	386	222	164	0	57.5	42.5	0.0
1908	391	219	172	0	56.0	44.0	0.0
1910	391	162	228	1	41.4	58.3	0.3
1912	435	127	290	18	29.2	66.7	4.1
1914	432	193	231	8	44.7	53.5	1.9
1916	435	216	210	9	49.7	48.3	2.1
1918	435	237	191	7	54.5	43.9	1.6
1920	433	300	132	1	69.3	30.5	0.2
1922	435	225	207	3	51.7	47.6	0.7
1924	435	247	183	5	56.8	42.1	1.1
1926	435	237	195	3	54.5	44.8	0.7
1928	431	267	163	1	61.9	37.8	0.2
1930	435	218	216	1	50.1	49.7	0.2
1932	435	117	313	5	26.9	72.0	1.1
1934	435	103	322	10	23.7	74.0	2.3
1936	435	89	333	13	20.5	76.6	3.0
1938	435	169	262	4	38.9	60.2	0.9
1940	435	162	267	6	37.2	61.4	1.4
1942	435	209	222	4	48.0	51.0	0.9
1944	435	190	243	2	43.7	55.9	0.5
1946	435	246	188	1	56.6	43.2	0.2
1948	435	171	263	1	39.3	60.5	0.2
1950	435	199	234	2	45.7	53.8	0.5
1952	435	221	213	1	50.8	49.0	0.2
1954	435	203	232	0	46.7	53.3	0.0
1956	435	201	234	0	46.2	53.8	0.0
1958	436	153	283	0	35.1	64.9	0.0
1960	437	175	262	0	40.0	60.0	0.0
1962	434	176	258	0	40.6	59.4	0.0
1964	435	140	295	0	32.2	67.8	0.0
1966	435	187	248	0	43.0	57.0	0.0
1968	435	192	243	0	44.1	55.9	0.0
1970	435	180	255	0	41.4	58.6	0.0
1972	435	192	242	1	44.1	55.6	0.2
1974	435	144	291	0	33.1	66.9	0.0
1976	435	143	292	0	32.9	67.1	0.0
1978	435	158	277	0	36.3	63.7	0.0
1980	435	192	243	0	44.1	55.9	0.0
1982	435	167	268	0	38.4	61.6	0.0
1984	435	182	253	0	41.8	58.2	0.0
1986	435	177	258	0	40.7	59.3	0.0
1988	435	175	260	0	40.2	59.8	0.0
1990	435	167	267	1	38.4	61.4	0.2
1992	435	176	258	1	40.5	59.3	0.2
1994	435	233	201	1	53.6	46.2	0.2
1996	435	228	206	1	52.4	47.4	0.2
1998	435	223	211	1	51.3	48.5	0.2
2000³	435	221	211	2	50.8	48.5	0.5
2002⁴	435	223	208	1	51.3	47.8	0.2
2004⁵	435	227	205	1	52.2	47.1	0.2
2006	435	202	233	0	46.4	53.6	0.0
1. Reflects seats won in that election year, for the Congress beginning in the following year. 2. Percentages may not add to 100 because of rounding. 3. One seat vacant. 4. Three seats vacant. 5. Two seats vacant.

Source: Congressional Research Service.

		Seat Allocation			Share of Total (%)²
Year¹	Total	Republican	Democrat	Other	Republican	Democrat	Other

1900	88	56	29	3	63.6	33.0	3.4
1902	90	58	32	0	64.4	35.6	0.0
1904	90	58	32	0	64.4	35.6	0.0
1906	90	61	29	0	67.8	32.2	0.0
1908	91	59	32	0	64.8	35.2	0.0
1910	91	49	42	0	53.8	46.2	0.0
1912	96	44	51	1	45.8	53.1	1.0
1914	96	39	56	1	40.6	58.3	1.0
1916	96	42	53	1	43.8	55.2	1.0
1918	96	48	47	1	50.0	49.0	1.0
1920	96	59	37	0	61.5	38.5	0.0
1922	96	51	43	2	53.1	44.8	2.1
1924	95	54	40	1	56.8	42.1	1.1
1926	96	48	47	1	50.0	49.0	1.0
1928	96	56	39	1	58.3	40.6	1.0
1930	96	48	47	1	50.0	49.0	1.0
1932	96	36	59	1	37.5	61.5	1.0
1934	96	25	69	2	26.0	71.9	2.1
1936	96	17	75	4	17.7	78.1	4.2
1938	96	23	69	4	24.0	71.9	4.2
1940	96	28	66	2	29.2	68.8	2.1
1942	96	38	57	1	39.6	59.4	1.0
1944	96	38	57	1	39.6	59.4	1.0
1946	96	51	45	0	53.1	46.9	0.0
1948	96	42	54	0	43.8	56.3	0.0
1950	96	47	48	1	49.0	50.0	1.0
1952	96	48	46	2	50.0	47.9	2.1
1954	96	47	48	1	49.0	50.0	1.0
1956	96	47	49	0	49.0	51.0	0.0
1958	98	34	64	0	34.7	65.3	0.0
1960	100	36	64	0	36.0	64.0	0.0
1962	100	33	67	0	33.0	67.0	0.0
1964	100	32	68	0	32.0	68.0	0.0
1966	100	36	64	0	36.0	64.0	0.0
1968	100	42	58	0	42.0	58.0	0.0
1970	100	44	54	2	44.0	54.0	2.0
1972	100	42	56	2	42.0	56.0	2.0
1974	100	37	61	2	37.0	61.0	2.0
1976	100	38	61	1	38.0	61.0	1.0
1978	100	41	58	1	41.0	58.0	1.0
1980	100	53	46	1	53.0	46.0	1.0
1982	100	54	46	0	54.0	46.0	0.0
1984	100	53	47	0	53.0	47.0	0.0
1986	100	45	55	0	45.0	55.0	0.0
1988	100	45	55	0	45.0	55.0	0.0
1990	100	44	56	0	44.0	56.0	0.0
1992	100	43	57	0	43.0	57.0	0.0
1994	100	53	47	0	53.0	47.0	0.0
1996	100	55	45	0	55.0	45.0	0.0
1998	100	55	45	0	55.0	45.0	0.0
2000	100	50	50	0	50.0	50.0	0.0
2002	100	51	48	1	51.0	48.0	1.0
2004	100	55	44	1	55.0	44.0	1.0
2006	100	49	49	2	49.0	49.0	2.0
1) Reflects seats won in that election year, for the Congress beginning the following year. 2) Percentages may not add to 100 because of rounding.

Source: Congressional Research Service.

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