Akashic
1876–2024
Elections / 2018 · Senate · WA

The Democratic candidate won Washington's Senate seat D+16.9.

Washington, 2018. Candidate results and statewide totals below.

Washington — 2018 Senate result
Source: MIT Election Data + Science Lab, 1976–2024 Senate returns (party-classified by literal ballot party).
Democratic (D)
1,803,364
58.4%
Republican (R)
1,282,804
41.6%
All others
0
0.0%
Margin
D+16.9
Candidates
Statewide candidate totals — MIT Election Data + Science Lab, 2018 Senate returns.
CandidatePartyVotesShare
Maria CantwellDDemocrat1,803,36458.4%
Susan HutchisonRRepublican1,282,80441.6%
2018 presidential election
Washington, 2018
DemocraticD+16.9
2018 presidential margin by county for Washington — 2018 US Senate electionA map of the constituent counties of Washington — 2018 US Senate election, each outlined and filled by its 2018 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), seated within the faint outlines of the surrounding states.KING, WA · D+48.3PIERCE, WA · D+6.7SNOHOMISH, WA · D+14.8SPOKANE, WA · R+1.5CLARK, WA · D+5.9THURSTON, WA · D+17.1KITSAP, WA · D+12.9WHATCOM, WA · D+19.5BENTON, WA · R+24.9YAKIMA, WA · R+16.3SKAGIT, WA · D+3.0COWLITZ, WA · R+7.7ISLAND, WA · D+6.4CLALLAM, WA · D+1.3LEWIS, WA · R+34.6CHELAN, WA · R+11.9GRAYS HARBOR, WA · R+4.4MASON, WA · R+4.3GRANT, WA · R+38.4WALLA WALLA, WA · R+7.3STEVENS, WA · R+35.5FRANKLIN, WA · R+19.5JEFFERSON, WA · D+37.6KITTITAS, WA · R+13.8WHITMAN, WA · D+9.0OKANOGAN, WA · R+12.8DOUGLAS, WA · R+27.7SAN JUAN, WA · D+45.2PACIFIC, WA · D+1.8KLICKITAT, WA · R+8.3ASOTIN, WA · R+16.4PEND OREILLE, WA · R+27.7SKAMANIA, WA · R+4.6LINCOLN, WA · R+42.5ADAMS, WA · R+35.5FERRY, WA · R+23.8WAHKIAKUM, WA · R+10.7COLUMBIA, WA · R+33.5GARFIELD, WA · R+32.5
How it voted
Share of the 2018 vote
Democratic ✓Democratic58.4%1,802,779
RepublicanRepublican41.6%1,282,006
OtherAll other candidates0.0%0
D+60
R+60
39 counties, each filled by 2018 D-vs-R margin. Hover any county for its result.
Washington's Senate margins
Every contest in our store, 1976–2024
Washington's Senate marginsDemocratic-minus-Republican presidential margin from 1976 to 2024. Most recent: +18.5% in 2024.flipped D · 1998+18.5%DR19762024
Washington's Senate margins
YearMargin (D minus R)
1976+47.6%
1980−8.3%
1982+44.7%
1986+2.0%
1988−2.2%
1992+8.0%
1994−11.5%
1998+16.8%
2000+0.1%
2004+12.2%
2006+16.9%
2010+4.7%
2012+20.9%
2016+18.0%
2018+16.9%
2022+14.5%
2024+18.5%