Elections were held on November 2, 2010, to determine Washington's nine members of the United States House of Representatives.

[12] In 2010 Inslee's opponent in the general election was James Watkins, a businessman and a member of the Republican Party.

[28] John Carmack, a structural-mechanical designer and contractor, also ran as a Republican;[29] while Larry Kalb, a member of the Democratic State Committee;[30] and Diana McGinness, a retired fraud investigator,[31] also ran as Democrats.

[40] After the initial count Koster led by less than 1,500 votes; however Larsen took the lead on November 3 and was later declared the winner.

[51] The candidates in the general election were Jaime Herrera Beutler, a Republican,[52] and Dennis Heck, a Democrat,[53] both of whom were members of the Washington House of Representatives.

Norma Jean Stevens, a small business owner, ran as an independent candidate.

[57] Deb Wallace, a member of the Washington House of Representatives,[58] Maria Rodriguez-Salazar, a nurse;[59] and Craig Pridemore, a member of the Washington Senate,[60] ran as Democrats but dropped out of the race in February, March and June 2010 respectively.

Democrat Brendan Williams, a member of the state House of Representatives, announced in December 2009 that he would not run.

[61] Jon Russell, the mayor pro tem of Washougal, ran as a Republican but ended his campaign in February 2010.

[62] Richard DeBolt, the leader of the Republican party in the state House of Representatives, announced in January 2010 that he would not run.

[77] Herrera Beutler was re-elected in 2012,[78] when Heck successfully ran in the newly created 10th district;[79] and in 2014.

[88] In 2010 Hastings's opponent in the general election was Jay Clough, a member of the United States Marine Corps who ran as a Democrat.

[91] Rex A. Brocki, a chapter president of Young Americans for Freedom, ran as a Tea Party candidate.

[103] In 2010 McMorris Rodgers's opponent in the general election was Daryl Romeyn, a television presenter and a member of the Democratic Party.

[105] Clyde Cordero, a vice president of the American GI Forum;[106] David R. Fox, a lawyer;[107] and Barbara Lampert, a retired nurse's aide,[108] also ran as Democrats.

Randall Yearout, an operations engineer and business owner, ran as a Constitution Party candidate.

[117] The 6th district included Bremerton, University Place and parts of Lakewood, Parkland and Tacoma.

[119] In 2010 Dicks's opponent in the general election was Doug Cloud, a lawyer and a member of the Republican Party.

[127] In 2012, Dicks retired rather than seeking re-election and was succeeded by Democrat Derek Kilmer,[128] while Cloud ran for the seat again.

[132] In 2012 McDermott's opponent in the general election was Bob Jeffers-Schroder, a member of Citizens' Climate Lobby who ran as an independent candidate.

[134] Bill Hoffman, a screenwriter and film producer;[135] Don Rivers, an advisor to elected officials;[136] and Scott Sizemore, the leader of the Seattle Youth and Beauty Brigade,[137] also ran as Democrats.

[144] The 8th district included Bellevue, Sammamish, and parts of Auburn, Kent, Renton and South Hill.

[146] In 2010 his opponent in the general election was Suzan DelBene, a businesswoman who ran as a Democrat.

[148] Keith Arnold, an accounting technician for the federal government;[149] Tom Cramer, a small business owner;[150] and Boleslaw (John) Olinski, a social worker with the Washington Department of Social and Health Services,[151] also ran as Democrats.

Tim Dillon, a member of the Yarrow Point town council;[152] and Ernest Huber, a retired lieutenant commander in the United States Navy,[153] also ran as Republicans.

[163] Sabato's Crystal Ball rated the race as "Leans Republican" and noted that "Reichert has the difficult task of defending his seat and voting record as an incumbent".

[144] The 9th district included Federal Way and parts of Kent, Lacey, Lakewood, Puyallup and Renton.

[174] In 2010 his opponent in the general election was Republican Dick Muri, a member of the Pierce County Council.

[178] Tom Campbell, a member of the Washington House of Representatives, had planned to seek the Republican nomination but ended his campaign in September 2009.

[187] Smith was again re-elected in 2012,[43] when Muri unsuccessfully ran in the newly created Washington's 10th congressional district;[79] and in 2014.