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Table 2 Years covered, total number of members (nodes), number of Democrats (excluding leaders), number of Republicans (excluding leaders), number of Democrat leaders, number of Republican leaders, and number of roll call votes for each Senate

From: Semi-supervised graph labelling reveals increasing partisanship in the United States Congress

Congress Years Members    Leaders   Votes
   Total Dem Rep Dem Rep  
74 1935 - 37 97 71 24 1 1 134
75 1937 - 39 98 80 15 2 1 130
76 1939 - 41 100 72 26 1 1 190
77 1941 - 43 106 74 30 1 1 122
78 1943 - 45 102 59 40 1 2 188
79 1945 - 47 102 59 41 1 1 151
80 1947 - 49 97 45 50 1 1 200
81 1949 - 51 107 59 46 1 1 375
82 1951 - 53 98 50 45 1 2 251
83 1953 - 55 109 52 54 1 2 159
84 1955 - 57 98 50 46 1 1 134
85 1957 - 59 101 52 47 1 1 149
86 1959 - 61 103 66 35 1 1 249
87 1961 - 63 105 64 39 1 1 272
88 1963 - 65 102 68 32 1 1 362
89 1965 - 67 103 69 32 1 1 295
90 1967 - 69 101 63 36 1 1 372
91 1969 - 71 102 57 42 1 2 328
92 1971 - 73 99 54 43 1 1 566
93 1973 - 75 100 56 42 1 1 582
94 1975 - 77 99 60 37 1 1 694
95 1977 - 79 103 64 37 1 1 495
96 1979 - 81 100 58 40 1 1 619
97 1981 - 83 100 45 53 1 1 471
98 1983 - 85 101 45 54 1 1 299
99 1985 - 87 101 46 53 1 1 355
100 1987 - 89 101 54 45 1 1 335
101 1989 - 91 101 55 44 1 1 280
102 1991 - 93 102 57 43 1 1 301
103 1993 - 95 101 56 43 1 1 465
104 1995 - 97 103 47 53 1 2 610
105 1997 - 99 100 44 54 1 1 329
106 1999 - 01 102 45 55 1 1 378
107 2001 - 03 100 49 49 1 1 332
108 2003 - 05 99 47 50 1 1 402
109 2005 - 07 100 44 54 1 1 376
110 2007 - 09 101 49 * 50 1 1 369
111 2009 - 11 110 65 43 1 1 512
112 2011 - 13 101 52 47 1 1 267
113 2013 - 15 103 56 45 1 1 433
114 2015 - 17 98 43 53 1 1 303
115 2017 - 19 103 47 54 1 1 378
  1. *Democrats formed a working majority in coalition with two Independent Senators
  2. Senates where the number of Democrats is shown in bold had a Democrat majority, and Senates where the number of Republicans is shown in bold had a Republican majority