United States Senate elections, 1974 Senate composition before the elections Senate composition before the elections

| D_49 | D_48 | D_47 | D_46 | D_45 | D_44 | D_43 | D_42 | D_41 | D_40 |
|---|---|---|---|---|---|---|---|---|---|
| D 10 | D 11 | D 12 | D 13 | D 14 | D 15 | D 16 | D 17 | D 18 | D 19 |
| D 29 | D 28 | D 27 | D 26 | D 25 | D 24 | D 23 | D 22 | D 21 | D 20 |
| D 30 | D 31 | D 32 | D 33 | D 34 | D 35 | D 36 | D 37 | D 38 | D 39 |
| D 49 | D 48 | D 47 | D 46 | D 45 | D 44 | D 43 | D 42 | D 41 | D 40 |
| D 50 | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority |