United States Senate elections, 1986 Senate composition before the elections Senate composition before the elections

| D_41 | D_42 | D_43 | D_44 | D_45 | D_46 | D_47 | R_53 | R_52 | R_51 |
|---|---|---|---|---|---|---|---|---|---|
| D 20 | D 19 | D 18 | D 17 | D 16 | D 15 | D 14 | D 13 | D 12 | D 11 |
| D 21 | D 22 | D 23 | D 24 | D 25 | D 26 | D 27 | D 28 | D 29 | D 30 |
| D 40 | D 39 | D 38 | D 37 | D 36 | D 35 | D 34 | D 33 | D 32 | D 31 |
| D 41 | D 42 | D 43 | D 44 | D 45 | D 46 | D 47 | R 53 | R 52 | R 51 |
| Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | Majority→ | R 51 |