Washington sent 5 Democrats and 4 Republicans to the US House in 2010.

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

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Washington — 2010 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	+15.3%	Jay Inslee	299,379
WA-02	D	+2.1%	Rick Larsen	303,963
WA-03	R	−5.9%	Jaime Herrera	288,453
WA-04	R	−35.3%	Doc Hastings	231,699
WA-05	R	−27.3%	Cathy McMorris	278,381
WA-06	D	+16.1%	Norman D Dicks	261,673
WA-07	D	+83.0%	Jim McDermott	280,390
WA-08	R	−4.1%	David G Reichert	309,877
WA-09	D	+9.7%	Adam Smith	225,594