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United States · Election results history · 2018 Senate · Washington
Election 2018 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

2018 US Senate election in Washington

Maria Cantwell (Democrat) beat Susan Hutchison (Republican) in Washington in 2018, 58.4% to 41.6%, a margin of 16.9 points and 520,560 votes.

The Democratic hold continued from 2012, when Maria Cantwell also won.

Republicans led in 25 of the 39 counties and Democrats in 14. The largest, King, cast 957,726 votes and went to the Democrat by 48.2 points. The closest was Pacific, where 195 votes separated the two parties.

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Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Maria Cantwell won Democratic 1,803,364 58.4%
Susan Hutchison Republican 1,282,804 41.6%
Total3,086,168

Every county

CountyDemocratRepublicanOthersTotalMargin
King 708,654 74.0% 247,071 25.8% 2,001 957,726 D+48.2
Pierce 174,081 53.4% 152,158 46.6% 326,239 D+6.7
Snohomish 184,203 57.4% 136,729 42.6% 320,932 D+14.8
Spokane 112,000 49.2% 115,508 50.8% 227,508 R+1.5
Clark 102,599 53.0% 91,119 47.0% 193,718 D+5.9
Thurston 72,673 58.5% 51,464 41.5% 124,137 D+17.1
Kitsap 67,847 56.5% 52,308 43.5% 120,155 D+12.9
Whatcom 64,971 59.8% 43,757 40.2% 108,728 D+19.5
Benton 28,181 37.6% 46,834 62.4% 75,015 R+24.9
Yakima 29,473 41.9% 40,939 58.1% 70,412 R+16.3
Skagit 28,119 51.5% 26,491 48.5% 54,610 D+3.0
Cowlitz 20,146 46.2% 23,487 53.8% 43,633 R+7.7
Island 22,341 53.2% 19,672 46.8% 42,013 D+6.4
Clallam 20,036 50.7% 19,504 49.3% 39,540 D+1.3
Lewis 11,076 32.7% 22,783 67.3% 33,859 R+34.6
Chelan 14,783 44.1% 18,759 55.9% 33,542 R+11.9
Grays Harbor 13,600 47.8% 14,849 52.2% 28,449 R+4.4
Mason 13,220 47.8% 14,416 52.2% 27,636 R+4.3
Grant 8,159 30.8% 18,333 69.2% 26,492 R+38.4
Walla Walla 11,826 46.4% 13,684 53.6% 25,510 R+7.3
Stevens 7,274 32.2% 15,296 67.8% 22,570 R+35.5
Franklin 8,972 40.3% 13,311 59.7% 22,283 R+19.5
Jefferson 14,331 68.8% 6,502 31.2% 20,833 D+37.6
Kittitas 8,330 43.1% 10,996 56.9% 19,326 R+13.8
Whitman 9,372 54.5% 7,825 45.5% 17,197 D+9.0
Okanogan 7,201 43.6% 9,317 56.4% 16,518 R+12.8
Douglas 5,390 36.2% 9,512 63.8% 14,902 R+27.7
San Juan 8,016 72.6% 3,026 27.4% 11,042 D+45.2
Pacific 5,527 50.9% 5,332 49.1% 10,859 D+1.8
Klickitat 4,889 45.8% 5,776 54.2% 10,665 R+8.3
Asotin 3,809 41.8% 5,298 58.2% 9,107 R+16.4
Pend Oreille 2,477 36.1% 4,379 63.9% 6,856 R+27.7
Skamania 2,663 47.7% 2,919 52.3% 5,582 R+4.6
Lincoln 1,604 28.8% 3,974 71.2% 5,578 R+42.5
Adams 1,365 32.3% 2,867 67.7% 4,232 R+35.5
Ferry 1,329 38.1% 2,159 61.9% 3,488 R+23.8
Wahkiakum 1,082 44.7% 1,341 55.3% 2,423 R+10.7
Columbia 731 33.2% 1,468 66.8% 2,199 R+33.5
Garfield 429 33.7% 843 66.3% 1,272 R+32.5

Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Washington Senate elections we hold

YearWinnerMargin
2024 Maria Cantwell (D) D+18.5
2022 Patty Murray (D) D+14.6
2018 Maria Cantwell (D) D+16.9
2016 Patty Murray (D) D+18.0
2012 Maria Cantwell (D) D+20.9
2010 Patty Murray (D) D+4.7
2006 Maria Cantwell (D) D+16.9
2004 Patty Murray (D) D+12.2
2000 Maria Cantwell (D) D+0.1
1998 Patty Murray (D) D+16.8
1994 Slade Gorton (R) R+11.5
1992 Patty Murray (D) D+8.0
1988 Slade Gorton (R) R+2.2
1986 Brock Adams (D) D+2.0
1982 Henry M. Jackson (D) D+44.7
1980 Slade Gorton (R) R+8.3
1976 Henry M. Jackson (D) D+47.6
1974 Warren Magnuson (D) D+24.6
1970 Scoop Jackson (D) D+66.4
1968 Warren Magnuson (D) D+29.1
1964 Scoop Jackson (D) D+44.4
1962 Warren Magnuson (D) D+4.8
1958 Scoop Jackson (D) D+35.9
1956 Warren Magnuson (D) D+22.2
1952 Scoop Jackson (D) D+12.7
1950 Warren Magnuson (D) D+7.4
1946 Harry P. Cain (R) R+9.1
1944 Warren Magnuson (D) D+10.7
1940 Monrad C. Wallgren (D) D+8.3
1938 Homer T. Bone (D) D+25.5
1934 Lewis Schwellenbach (D) D+26.9
1932 Homer T. Bone (D) D+27.9
1928 Clarence C. Dill (D) D+7.0
1926 Wesley L. Jones (R) R+4.8
1922 Clarence C. Dill (D) D+1.3
1920 Wesley L. Jones (R) R+38.6
1916 Miles Poindexter (R) R+18.3
1914 Wesley L. Jones (R) R+11.2