United States Senate elections, 1970 Senate composition before the elections Senate composition before the elections

| D_50 | D_49 | D_48 | D_47 | D_46 | D_45 | D_44 | D_43 | D_42 | D_41 |
|---|---|---|---|---|---|---|---|---|---|
| D 51 | D 52 | D 53 | D 54 | D 55 | D 56 | D 57 | R 43 | R 42 | R 41 |
| R 31 | R 32 | R 33 | R 34 | R 35 | R 36 | R 37 | R 38 | R 39 | R 40 |
| R 30 | R 29 | R 28 | R 27 | R 26 | R 25 | R 24 | R 23 | R 22 | R 21 |
| R 11 | R 12 | R 13 | R 14 | R 15 | R 16 | R 17 | R 18 | R 19 | R 20 |
| R 10 | R 9 | R 8 | R 7 | R 6 | R 5 | R 4 | R 3 | R 2 | R 1 |