Adams |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1695 |
| Norward J. Brooks | R | 1007 |
Asotin |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2160 |
| Norward J. Brooks | R | 1038 |
Benton |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10155 |
| Norward J. Brooks | R | 6988 |
Chelan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 5223 |
| Norward J. Brooks | R | 3553 |
Clallam |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 7378 |
| Norward J. Brooks | R | 3424 |
Clark |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 18404 |
| Norward J. Brooks | R | 9879 |
Columbia |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 825 |
| Norward J. Brooks | R | 624 |
Cowlitz |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10314 |
| Norward J. Brooks | R | 3830 |
Douglas |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2954 |
| Norward J. Brooks | R | 1414 |
Ferry |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 627 |
| Norward J. Brooks | R | 285 |
Franklin |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3888 |
| Norward J. Brooks | R | 2002 |
Garfield |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 558 |
| Norward J. Brooks | R | 344 |
Grant |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6149 |
| Norward J. Brooks | R | 2512 |
Grays Harbor |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 11365 |
| Norward J. Brooks | R | 3572 |
Island |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4227 |
| Norward J. Brooks | R | 3065 |
Jefferson |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2228 |
| Norward J. Brooks | R | 1027 |
King |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 172799 |
| Norward J. Brooks | R | 101624 |
Kitsap |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 19132 |
| Norward J. Brooks | R | 7203 |
Kittitas |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3943 |
| Norward J. Brooks | R | 1842 |
Klickitat |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2293 |
| Norward J. Brooks | R | 1239 |
Lewis |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 9259 |
| Norward J. Brooks | R | 3826 |
Lincoln |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2166 |
| Norward J. Brooks | R | 1436 |
Mason |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4712 |
| Norward J. Brooks | R | 1751 |
Okanogan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4853 |
| Norward J. Brooks | R | 2209 |
Pacific |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3497 |
| Norward J. Brooks | R | 1088 |
Pend Oreille |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1297 |
| Norward J. Brooks | R | 562 |
Pierce |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 59295 |
| Norward J. Brooks | R | 24577 |
San Juan |
| Candidate | Party | Votes |
|---|
| Norward J. Brooks | R | 972 |
| Robert S. O'Brien | D | 968 |
Skagit |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10275 |
| Norward J. Brooks | R | 5338 |
Skamania |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1183 |
| Norward J. Brooks | R | 516 |
Snohomish |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 36777 |
| Norward J. Brooks | R | 18183 |
Spokane |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 41702 |
| Norward J. Brooks | R | 24926 |
Stevens |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2912 |
| Norward J. Brooks | R | 1578 |
Thurston |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 19957 |
| Norward J. Brooks | R | 7156 |
Wahkiakum |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 763 |
| Norward J. Brooks | R | 327 |
Walla Walla |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 5388 |
| Norward J. Brooks | R | 4374 |
Whatcom |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10716 |
| Norward J. Brooks | R | 6448 |
Whitman |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4296 |
| Norward J. Brooks | R | 3135 |
Yakima |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 16090 |
| Norward J. Brooks | R | 11656 |