United States Senate elections, 1964 Senate composition as a result of the elections Senate composition as a result of the elections

| D_50_ | D_49_ | D_48_ | D_47_ | D_46_ | D_45_ | D_44_ | D_43_ | D_42_ | D_41_ |
|---|---|---|---|---|---|---|---|---|---|
| D 51 √ | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority |
| D 51 √ | D 52 √ | D 53 √ | D 54 √ | D 55 √ | D 56 √ | D 57 √ | D 58 √ | D 59 √ | D 60 √ |
| R 31 O | R 32 + | D 68 + | D 67 + | D 66 + | D 65 O | D 64 O | D 63 √ | D 62 √ | D 61 √ |
| R 30 √ | R 29 √ | R 28 √ | R 27 √ | R 26 √ | R 25 | R 24 | R 23 | R 22 | R 21 |