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Table 1 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 House

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 - 37 429 322 104 2 1 194
75 1937 - 39 431 338 91 1 1 135
76 1939 - 41 452 272 177 2 1 172
77 1941 - 43 442 273 167 1 1 95
78 1943 - 45 445 226 217 1 1 94
79 1945 - 47 444 249 193 1 1 149
80 1947 - 49 446 193 251 1 1 106
81 1949 - 51 442 265 175 1 1 169
82 1951 - 53 445 238 205 1 1 122
83 1953 - 55 439 217 220 1 1 63
84 1955 - 57 437 233 202 1 1 60
85 1957 - 59 443 238 203 1 1 106
86 1959 - 61 441 284 155 1 1 104
87 1961 - 63 449 270 176 2 1 123
88 1963 - 65 442 260 180 1 1 124
89 1965 - 67 442 299 141 1 1 251
90 1967 - 69 437 247 188 1 1 211
91 1969 - 71 448 248 198 1 1 139
92 1971 - 73 443 257 184 1 1 326
93 1973 - 75 441 245 193 1 2 562
94 1975 - 77 441 293 146 1 1 709
95 1977 - 79 441 293 146 1 1 783
96 1979 - 81 440 279 159 1 1 691
97 1981 - 83 441 245 194 1 1 354
98 1983 - 85 439 271 166 1 1 471
99 1985 - 87 439 256 181 1 1 554
100 1987 - 89 440 260 178 1 1 558
101 1989 - 91 443 262 178 2 1 521
102 1991 - 93 440 269 169 1 1 560
103 1993 - 95 440 259 179 1 1 735
104 1995 - 97 444 207 235 1 1 980
105 1997 - 99 442 210 230 1 1 794
106 1999 - 01 438 212 224 1 1 699
107 2001 - 03 441 212 227 1 1 530
108 2003 - 05 439 207 230 1 1 721
109 2005 - 07 439 202 233 1 3 714
110 2007 - 09 448 241 205 1 1 1233
111 2009 - 11 446 262 182 1 1 944
112 2011 - 13 445 199 244 1 1 1236
113 2013 - 15 444 203 238 1 2 888
114 2015 - 17 440 189 249 1 1 1028
115 2017 - 19 450 199 249 1 1 865
  1. Houses where the number of Democrats is shown in bold had a Democrat majority, and Houses where the number of Republicans is shown in bold had a Republican majority