United States Senate elections, 1958 Senate composition before the elections Senate composition before the elections

| D_48 | D_47 | D_46 | D_45 | D_44 | D_43 | D_42 | D_41 |
|---|---|---|---|---|---|---|---|
| R 29 | R 30 | R 31 | R 32 | R 33 | R 34 | R 35 | R 36 |
| R 28 | R 27 | R 26 | R 25 | R 24 | R 23 | R 22 | R 21 |
| R 9 | R 10 | R 11 | R 12 | R 13 | R 14 | R 15 | R 16 |
| R 8 | R 7 | R 6 | R 5 | R 4 | R 3 | R 2 | R 1 |