Washington sent 7 Democrats and 3 Republicans to the US House in 2018.

10 districts. Each row shows the winning party, margin, and member elected. Vote counts are the certified district totals.

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Washington — 2018 House districts

Source: MIT Election Data + Science Lab, US House returns (party-classified by literal ballot party).

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District	Won	Margin	Member elected	Votes
WA-01	D	+18.5%	Suzan Delbene	332,743
WA-02	D	+71.3%	Rick Larsen	294,833
WA-03	R	−5.3%	Jaime Herrera Beutler	307,226
WA-04	R	−25.6%	Dan Newhouse	225,336
WA-05	R	−9.5%	Cathy McMorris Rodgers	320,347
WA-06	D	+27.8%	Derek Kilmer	323,086
WA-07	D	+67.1%	Pramila Jayapal	394,681
WA-08	D	+4.8%	Kim Schrier	313,057
WA-09	D	+100.0%	Adam Smith	240,567
WA-10	D	+23.1%	Denny Heck	270,075