Washington's 10th congressional district encompasses the southern Puget Sound. The district includes portions of Thurston, Pierce, and Mason counties. It includes Joint Base Lewis-McCord and the cities of Shelton, Olympia, Lakewood, University Place, Fife, and Puyallup.
The tenth congressional district was created after 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 10th Congressional District is in the western central portion of the state and includes portions of Thurston, Pierce, and Mason. The 10th Congressional includes all of Legislative Districts (LDs) 22, most of LDs 25 and 28, and parts of LDs 2, 20, 27, 29, 31, and 35.