Adams |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1337 |
| William B. (Bill) Pilkey | R | 846 |
| Mack J.T. Barnette | L | 134 |
Asotin |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2238 |
| William B. (Bill) Pilkey | R | 1085 |
| Mack J.T. Barnette | L | 180 |
Benton |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 9841 |
| William B. (Bill) Pilkey | R | 7899 |
| Mack J.T. Barnette | L | 876 |
Chelan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 5603 |
| William B. (Bill) Pilkey | R | 3056 |
| Mack J.T. Barnette | L | 501 |
Clallam |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 7919 |
| William B. (Bill) Pilkey | R | 4361 |
| Mack J.T. Barnette | L | 659 |
Clark |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 15300 |
| William B. (Bill) Pilkey | R | 7541 |
| Mack J.T. Barnette | L | 924 |
Columbia |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 708 |
| William B. (Bill) Pilkey | R | 487 |
| Mack J.T. Barnette | L | 37 |
Cowlitz |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 8369 |
| William B. (Bill) Pilkey | R | 2978 |
| Mack J.T. Barnette | L | 689 |
Douglas |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2528 |
| William B. (Bill) Pilkey | R | 1326 |
| Mack J.T. Barnette | L | 151 |
Ferry |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 697 |
| William B. (Bill) Pilkey | R | 347 |
| Mack J.T. Barnette | L | 51 |
Franklin |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2712 |
| William B. (Bill) Pilkey | R | 1487 |
| Mack J.T. Barnette | L | 337 |
Garfield |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 472 |
| William B. (Bill) Pilkey | R | 248 |
| Mack J.T. Barnette | L | 17 |
Grant |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4524 |
| William B. (Bill) Pilkey | R | 2434 |
| Mack J.T. Barnette | L | 509 |
Grays Harbor |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 11034 |
| William B. (Bill) Pilkey | R | 2851 |
| Mack J.T. Barnette | L | 770 |
Island |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 6444 |
| William B. (Bill) Pilkey | R | 3786 |
| Mack J.T. Barnette | L | 556 |
Jefferson |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2907 |
| William B. (Bill) Pilkey | R | 1179 |
| Mack J.T. Barnette | L | 281 |
King |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 173472 |
| William B. (Bill) Pilkey | R | 78424 |
| Mack J.T. Barnette | L | 9133 |
Kitsap |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 21718 |
| William B. (Bill) Pilkey | R | 9808 |
| Mack J.T. Barnette | L | 1157 |
Kittitas |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 4267 |
| William B. (Bill) Pilkey | R | 1704 |
| Mack J.T. Barnette | L | 202 |
Klickitat |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 2322 |
| William B. (Bill) Pilkey | R | 1084 |
| Mack J.T. Barnette | L | 134 |
Lewis |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 8271 |
| William B. (Bill) Pilkey | R | 4090 |
| Mack J.T. Barnette | L | 587 |
Lincoln |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1648 |
| William B. (Bill) Pilkey | R | 1051 |
| Mack J.T. Barnette | L | 87 |
Mason |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 5981 |
| William B. (Bill) Pilkey | R | 2205 |
| Mack J.T. Barnette | L | 405 |
Okanogan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3627 |
| William B. (Bill) Pilkey | R | 1867 |
| Mack J.T. Barnette | L | 326 |
Pacific |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3939 |
| William B. (Bill) Pilkey | R | 1035 |
| Mack J.T. Barnette | L | 445 |
Pend Oreille |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1274 |
| William B. (Bill) Pilkey | R | 711 |
| Mack J.T. Barnette | L | 58 |
Pierce |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 52273 |
| William B. (Bill) Pilkey | R | 22871 |
| Mack J.T. Barnette | L | 5123 |
San Juan |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1728 |
| William B. (Bill) Pilkey | R | 1305 |
| Mack J.T. Barnette | L | 152 |
Skagit |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 11124 |
| William B. (Bill) Pilkey | R | 5930 |
| Mack J.T. Barnette | L | 815 |
Skamania |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 1278 |
| William B. (Bill) Pilkey | R | 565 |
| Mack J.T. Barnette | L | 66 |
Snohomish |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 43455 |
| William B. (Bill) Pilkey | R | 21048 |
| Mack J.T. Barnette | L | 3214 |
Spokane |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 37629 |
| William B. (Bill) Pilkey | R | 21437 |
| Mack J.T. Barnette | L | 1954 |
Stevens |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3659 |
| William B. (Bill) Pilkey | R | 2689 |
| Mack J.T. Barnette | L | 420 |
Thurston |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 23983 |
| William B. (Bill) Pilkey | R | 9213 |
| Mack J.T. Barnette | L | 1766 |
Wahkiakum |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 743 |
| William B. (Bill) Pilkey | R | 223 |
| Mack J.T. Barnette | L | 35 |
Walla Walla |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 5772 |
| William B. (Bill) Pilkey | R | 3953 |
| Mack J.T. Barnette | L | 445 |
Whatcom |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 13517 |
| William B. (Bill) Pilkey | R | 7275 |
| Mack J.T. Barnette | L | 1057 |
Whitman |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 3166 |
| William B. (Bill) Pilkey | R | 2060 |
| Mack J.T. Barnette | L | 207 |
Yakima |
| Candidate | Party | Votes |
|---|
| Robert S. O'Brien | D | 15630 |
| William B. (Bill) Pilkey | R | 9583 |
| Mack J.T. Barnette | L | 1367 |