United States Senate elections, 2010 Senate composition at the beginning of the Senate composition at the beginning of the

| D_39_ | D_40_ | D_41_ | D_42_ | D_43_ | D_44_ | D_45_ | D_46_ | D_47_ | D_48_ |
|---|---|---|---|---|---|---|---|---|---|
| D 18 | D 17 | D 16 | D 15 | D 14 | D 13 | D 12 | D 11 | D 10 | D 9 |
| D 19 | D 20 | D 21 | D 22 | D 23 | D 24 | D 25 | D 26 | D 27 | D 28 |
| D 38 | D 37 | D 36 | D 35 | D 34 | D 33 | D 32 | D 31 | D 30 | D 29 |
| D 39 √ | D 40 √ | D 41 √ | D 42 √ | D 43 √ | D 44 √ | D 45 √ | D 46 √ | D 47 √ | D 48 √ |