Adams |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2755 |
| Norward J. Brooks | R | 1389 |
Asotin |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3530 |
| Norward J. Brooks | R | 1643 |
Benton |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 18497 |
| Norward J. Brooks | R | 10450 |
Chelan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 9583 |
| Norward J. Brooks | R | 6423 |
Clallam |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10081 |
| Norward J. Brooks | R | 4900 |
Clark |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 36099 |
| Norward J. Brooks | R | 19441 |
Columbia |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1190 |
| Norward J. Brooks | R | 738 |
Cowlitz |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 18650 |
| Norward J. Brooks | R | 6371 |
Douglas |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4627 |
| Norward J. Brooks | R | 2413 |
Ferry |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 976 |
| Norward J. Brooks | R | 399 |
Franklin |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6773 |
| Norward J. Brooks | R | 2899 |
Garfield |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 957 |
| Norward J. Brooks | R | 443 |
Grant |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10458 |
| Norward J. Brooks | R | 4395 |
Grays Harbor |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 17662 |
| Norward J. Brooks | R | 5053 |
Island |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6091 |
| Norward J. Brooks | R | 4262 |
Jefferson |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3242 |
| Norward J. Brooks | R | 1504 |
King |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 298072 |
| Norward J. Brooks | R | 181582 |
Kitsap |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 32198 |
| Norward J. Brooks | R | 12126 |
Kittitas |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6350 |
| Norward J. Brooks | R | 3039 |
Klickitat |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3311 |
| Norward J. Brooks | R | 1590 |
Lewis |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 14029 |
| Norward J. Brooks | R | 5366 |
Lincoln |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3150 |
| Norward J. Brooks | R | 1727 |
Mason |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6896 |
| Norward J. Brooks | R | 2528 |
Okanogan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6457 |
| Norward J. Brooks | R | 3123 |
Pacific |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4999 |
| Norward J. Brooks | R | 1482 |
Pend Oreille |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1885 |
| Norward J. Brooks | R | 863 |
Pierce |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 98327 |
| Norward J. Brooks | R | 38943 |
San Juan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1312 |
| Norward J. Brooks | R | 1188 |
Skagit |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 15165 |
| Norward J. Brooks | R | 8223 |
Skamania |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1728 |
| Norward J. Brooks | R | 720 |
Snohomish |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 68355 |
| Norward J. Brooks | R | 32007 |
Spokane |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 80546 |
| Norward J. Brooks | R | 39179 |
Stevens |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4759 |
| Norward J. Brooks | R | 2451 |
Thurston |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 28664 |
| Norward J. Brooks | R | 9203 |
Wahkiakum |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1094 |
| Norward J. Brooks | R | 417 |
Walla Walla |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 10168 |
| Norward J. Brooks | R | 6490 |
Whatcom |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 21428 |
| Norward J. Brooks | R | 13325 |
Whitman |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 8511 |
| Norward J. Brooks | R | 5990 |
Yakima |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 30195 |
| Norward J. Brooks | R | 19325 |