|Washington's 10th congressional district|
|Area||827 sq mi (2,140 km2)|
|Population (2011 est.)||685,260|
Washington's 10th congressional district is a congressional district in western Washington. Created as a result of the 2010 census, which granted Washington an additional congressional seat, bringing the number of seats apportioned to the state up from 9 to 10, the district is centered on the state capital, Olympia, and includes portions of Thurston, Pierce, and Mason counties. It was created after the 2010 United States Census and elected Denny Heck to the United States House of Representatives in the 2012 elections.
By Washington state law, a non-partisan commission composed of two Republicans, two Democrats, and a non-voting chairperson drew the boundaries for this new district, as well as the new boundaries for Washington's existing districts. The Washington Redistricting Commission was tasked with drawing the maps for congressional and legislative districts in the year after each census, including the new 10th Congressional District. The first commissioners' maps were released on September 13, 2011. In addition, several third party maps were submitted to the commissioners by citizens and advocacy groups.
Commissioner Ceis, representing the Senate Democratic leadership, submitted a draft plan that would place the new 10th district in SW Pierce, northern Thurston, eastern Mason, and far southern King counties. It would include the cities of Shelton, Olympia, Fircrest, Pacific, Fife, Puyallup, and part of Tacoma. Federal Way, Auburn, Bonney Lake, Orting, Yelm, and McCleary were just outside the borders of the proposed 10th district. This proposed 10th district voted for Democrat Patty Murray over Republican Dino Rossi about 53.7/46.3 in the 2010 Senate Election, and is around 68.3% white.
Commissioner Gorton, representing the Senate Republican leadership, submitted a draft plan placing the new 10th district across the northern part of the state, straddling the Cascade mountains to take in Island, San Juan, Whatcom, Skagit, Chelan, Douglas, Okanogan, northern and eastern parts of Snohmish county, and the city of Skykomish in King county. It would have included the cities of Bellingham, Granite Falls, Arlington, Monroe, Wenatchee, Iroville, and most of Coulee Dam. Grand Coulee, Quincy, Republic, and Marysville were just outside the proposed boundaries. This proposed 10th district voted for Republican Dino Rossi over Democrat Patty Murray about 52.6/47.4, and is 79% white. Gorton's proposal also suggested the possibility of renumbering the congressional districts from west to east, which would mean that district No. 10 would be in the far east of the state, where the existing (pre-2012) 5th district was located.
Commissioner Foster, representing the House Democratic leadership, submitted a draft plan that would place the new 10th district on the Pacific Coast, Olympic Peninsula, and south Puget Sound, taking in Pacific, Grays Harbor, Clallam, all but the easternmost portion of Jefferson, western Mason, northern Thurston, and southwest Pierce counties. It would include Sequim, Olympia, Fife, Puyallup, Eatonville, and Steilacoom, while excluding Shelton, Port Townsend, Lakewood, Sumner, Orting, Tacoma, and Yelm. This proposed 10th district voted for Democrat Patty Murray over Republican Dino Rossi 51.3/48.7, and is 75.8% white.
Commissioner Huff, representing the House Republican leadership, submitted a draft plan that would make the new 10th district a majority-minority district, entirely in south King county. It would include, Federal Way, Kent, Newcastle, SeaTac, Des Moines, Pacific, and parts of south Seattle, Auburn, and Burien. This proposed 10th district voted for Democrat Patty Murray over Republican Dino Rossi 63/37, and is 48.8% white, 19.9% Asian, 13.6% Hispanic, 11.9% Black, and 5.9% Native and others.
Several third parties submitted draft plans to the Redistricting Commission for consideration. Of those plans, United for Fair Representation WA / Win-Win Network submitted a plan quite similar to Commissioner Foster's draft proposal for the 10th district. John Milem's submission includes a district that closely matches Commissioner Gorton's draft proposal for the 10th. United for Fair Representation's Unity map proposal also has a district quite similar to the draft proposal from Commissioner Ceis. Van Anderson submitted a proposal that includes a coastal/Olympic peninsula 10th district similar to Commissioner Foster's draft proposal for the 10th district.
At the December 16, 2011 Redistricting Commission meeting, Commissioners Gorton and Ceis were tasked with developing the 2012 congressional district map, while Commissioners Foster and Huff worked on a legislative plan for Eastern Washington. At the December 28 meeting, Commissioners Ceis and Gorton released a proposed Congressional map which created a 10th District centered on Olympia including Fort Lewis/McChord Air Field (Joint Base Lewis-McChord facility), McNeil and Anderson islands, the cities of Shelton, Tenino, University Place, Puyallup, Fife, Edgewood, Sumner, most of eastern Tacoma, and the Pierce County portions of Milton and Pacific. The final map of the 10th Congressional District did not deviate significantly from the Gorton/Ceis proposal (see next para.). The state legislature will be able to amend the finalized Commission borders by up to 2% of the population with a supermajority vote.
The Washington Redistricting Commission officially approved a congressional redistricting plan for the approval of the state legislature on January 1, 2012, just before 10 pm, two hours before the statutory deadline. The final congressional plan for the 10th district closely mirrored the Gorton/Ceis proposal, except that the cities of Milton and Pacific were placed entirely in the 8th district, instead of being split at the King/Pierce county line. In compensation for the loss of Milton and Pacific, the dividing line between the 10th and 8th districts was altered to include a larger population between Puyallup and Roy. 
|Election results from presidential races|
|2012||President||Obama 56 - 41%|
|2016||President||Clinton 51 - 39%|
The district was created January 3, 2013, as Washington elected a 10th district representative.
|Democratic||January 3, 2013 -
|Elected in 2012.|
As of September 2019, there are no living former members, as Heck is the district's sole representative in its entire existence.