Adams |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 1653 |
| Warren G. Magnuson | D | 906 |
| Josephine B. Sulston | PR | 3 |
| Ray C. Roberts | S | 3 |
Asotin |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 1694 |
| Harry P. Cain | R | 1334 |
| Ray C. Roberts | S | 6 |
| Josephine B. Sulston | PR | 2 |
Benton |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 3899 |
| Harry P. Cain | R | 3852 |
| Josephine B. Sulston | PR | 14 |
| Ray C. Roberts | S | 11 |
Chelan |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 7238 |
| Warren G. Magnuson | D | 5948 |
| Josephine B. Sulston | PR | 24 |
| Ray C. Roberts | S | 9 |
Clallam |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 5266 |
| Harry P. Cain | R | 3478 |
| Ray C. Roberts | S | 14 |
| Josephine B. Sulston | PR | 12 |
Clark |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 16942 |
| Harry P. Cain | R | 12345 |
| Josephine B. Sulston | PR | 128 |
| Ray C. Roberts | S | 69 |
Columbia |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 1247 |
| Warren G. Magnuson | D | 871 |
| Ray C. Roberts | S | 3 |
| Josephine B. Sulston | PR | 2 |
Cowlitz |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 9618 |
| Harry P. Cain | R | 6303 |
| Josephine B. Sulston | PR | 44 |
| Ray C. Roberts | S | 28 |
Douglas |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 1814 |
| Warren G. Magnuson | D | 1637 |
| Ray C. Roberts | S | 9 |
| Josephine B. Sulston | PR | 4 |
Ferry |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 705 |
| Harry P. Cain | R | 498 |
| Ray C. Roberts | S | 2 |
| Josephine B. Sulston | PR | 0 |
Franklin |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 1778 |
| Harry P. Cain | R | 1341 |
| Ray C. Roberts | S | 6 |
| Josephine B. Sulston | PR | 2 |
Garfield |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 963 |
| Warren G. Magnuson | D | 511 |
| Josephine B. Sulston | PR | 4 |
| Ray C. Roberts | S | 0 |
Grant |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 2238 |
| Harry P. Cain | R | 1501 |
| Ray C. Roberts | S | 5 |
| Josephine B. Sulston | PR | 1 |
Grays Harbor |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 12333 |
| Harry P. Cain | R | 8413 |
| Josephine B. Sulston | PR | 23 |
| Ray C. Roberts | S | 19 |
Island |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 1594 |
| Harry P. Cain | R | 1410 |
| Josephine B. Sulston | PR | 17 |
| Ray C. Roberts | S | 10 |
Jefferson |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 1739 |
| Harry P. Cain | R | 1419 |
| Ray C. Roberts | S | 8 |
| Josephine B. Sulston | PR | 0 |
King |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 157280 |
| Harry P. Cain | R | 114662 |
| Ray C. Roberts | S | 854 |
| Josephine B. Sulston | PR | 553 |
Kitsap |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 23946 |
| Harry P. Cain | R | 10761 |
| Ray C. Roberts | S | 63 |
| Josephine B. Sulston | PR | 50 |
Kittitas |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 3934 |
| Harry P. Cain | R | 3379 |
| Josephine B. Sulston | PR | 23 |
| Ray C. Roberts | S | 8 |
Klickitat |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 1870 |
| Warren G. Magnuson | D | 1793 |
| Josephine B. Sulston | PR | 20 |
| Ray C. Roberts | S | 17 |
Lewis |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 9038 |
| Warren G. Magnuson | D | 6992 |
| Josephine B. Sulston | PR | 29 |
| Ray C. Roberts | S | 20 |
Lincoln |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 2699 |
| Warren G. Magnuson | D | 2133 |
| Josephine B. Sulston | PR | 2 |
| Ray C. Roberts | S | 2 |
Mason |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 3087 |
| Harry P. Cain | R | 2005 |
| Ray C. Roberts | S | 17 |
| Josephine B. Sulston | PR | 2 |
Okanogan |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 4259 |
| Harry P. Cain | R | 3926 |
| Ray C. Roberts | S | 6 |
| Josephine B. Sulston | PR | 4 |
Pacific |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 3428 |
| Harry P. Cain | R | 2477 |
| Josephine B. Sulston | PR | 2 |
| Ray C. Roberts | S | 2 |
Pend Oreille |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 1257 |
| Harry P. Cain | R | 1068 |
| Ray C. Roberts | S | 4 |
| Josephine B. Sulston | PR | 0 |
Pierce |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 45429 |
| Harry P. Cain | R | 37321 |
| Ray C. Roberts | S | 301 |
| Josephine B. Sulston | PR | 202 |
San Juan |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 677 |
| Warren G. Magnuson | D | 596 |
| Josephine B. Sulston | PR | 0 |
| Ray C. Roberts | S | 0 |
Skagit |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 8969 |
| Harry P. Cain | R | 7782 |
| Josephine B. Sulston | PR | 0 |
| Ray C. Roberts | S | 0 |
Skamania |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 848 |
| Harry P. Cain | R | 625 |
| Josephine B. Sulston | PR | 4 |
| Ray C. Roberts | S | 3 |
Snohomish |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 26301 |
| Harry P. Cain | R | 14844 |
| Josephine B. Sulston | PR | 92 |
| Ray C. Roberts | S | 73 |
Spokane |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 42410 |
| Harry P. Cain | R | 37134 |
| Ray C. Roberts | S | 119 |
| Josephine B. Sulston | PR | 54 |
Stevens |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 3581 |
| Harry P. Cain | R | 3148 |
| Ray C. Roberts | S | 19 |
| Josephine B. Sulston | PR | 13 |
Thurston |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 8846 |
| Harry P. Cain | R | 8478 |
| Josephine B. Sulston | PR | 39 |
| Ray C. Roberts | S | 32 |
Wahkiakum |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 945 |
| Harry P. Cain | R | 531 |
| Ray C. Roberts | S | 2 |
| Josephine B. Sulston | PR | 0 |
Walla Walla |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 7492 |
| Warren G. Magnuson | D | 5148 |
| Josephine B. Sulston | PR | 25 |
| Ray C. Roberts | S | 13 |
Whatcom |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 13733 |
| Harry P. Cain | R | 12774 |
| Josephine B. Sulston | PR | 111 |
| Ray C. Roberts | S | 83 |
Whitman |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 6230 |
| Warren G. Magnuson | D | 4605 |
| Josephine B. Sulston | PR | 6 |
| Ray C. Roberts | S | 6 |
Yakima |
| Candidate | Party | Votes |
|---|
| Harry P. Cain | R | 20626 |
| Warren G. Magnuson | D | 14814 |
| Josephine B. Sulston | PR | 87 |
| Ray C. Roberts | S | 66 |