Adams |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 3272 |
| Warren G. Magnuson | D | 1511 |
Asotin |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 3441 |
| Warren G. Magnuson | D | 3217 |
Benton |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 24837 |
| Warren G. Magnuson | D | 19655 |
Chelan |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 12054 |
| Warren G. Magnuson | D | 7183 |
Clallam |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 12676 |
| Warren G. Magnuson | D | 9573 |
Clark |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 36593 |
| Warren G. Magnuson | D | 34888 |
Columbia |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 1279 |
| Warren G. Magnuson | D | 731 |
Cowlitz |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 15333 |
| Slade Gorton | R | 12261 |
Douglas |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 5562 |
| Warren G. Magnuson | D | 3183 |
Ferry |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 1025 |
| Warren G. Magnuson | D | 970 |
Franklin |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 6579 |
| Warren G. Magnuson | D | 5176 |
Garfield |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 903 |
| Warren G. Magnuson | D | 555 |
Grant |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 10812 |
| Warren G. Magnuson | D | 6905 |
Grays Harbor |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 14196 |
| Slade Gorton | R | 11861 |
Island |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 10871 |
| Warren G. Magnuson | D | 7248 |
Jefferson |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 4168 |
| Slade Gorton | R | 3855 |
King |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 308050 |
| Warren G. Magnuson | D | 286096 |
Kitsap |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 32916 |
| Slade Gorton | R | 27797 |
Kittitas |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 6122 |
| Warren G. Magnuson | D | 4381 |
Klickitat |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 3097 |
| Warren G. Magnuson | D | 2850 |
Lewis |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 15020 |
| Warren G. Magnuson | D | 7809 |
Lincoln |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 3451 |
| Warren G. Magnuson | D | 1924 |
Mason |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 7525 |
| Warren G. Magnuson | D | 6212 |
Okanogan |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 7160 |
| Warren G. Magnuson | D | 5298 |
Pacific |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 4336 |
| Slade Gorton | R | 3694 |
Pend Oreille |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 2197 |
| Warren G. Magnuson | D | 1517 |
Pierce |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 89286 |
| Warren G. Magnuson | D | 83891 |
San Juan |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 2916 |
| Warren G. Magnuson | D | 1903 |
Skagit |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 17150 |
| Warren G. Magnuson | D | 13637 |
Skamania |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 1552 |
| Slade Gorton | R | 1376 |
Snohomish |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 74862 |
| Warren G. Magnuson | D | 61255 |
Spokane |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 86210 |
| Warren G. Magnuson | D | 55587 |
Stevens |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 7643 |
| Warren G. Magnuson | D | 3886 |
Thurston |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 30900 |
| Warren G. Magnuson | D | 23996 |
Wahkiakum |
| Candidate | Party | Votes |
|---|
| Warren G. Magnuson | D | 856 |
| Slade Gorton | R | 816 |
Walla Walla |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 11944 |
| Warren G. Magnuson | D | 6913 |
Whatcom |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 25148 |
| Warren G. Magnuson | D | 20715 |
Whitman |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 9896 |
| Warren G. Magnuson | D | 7119 |
Yakima |
| Candidate | Party | Votes |
|---|
| Slade Gorton | R | 36176 |
| Warren G. Magnuson | D | 22911 |