Washington's 6th congressional district encompasses the Olympic Peninsula, the Kitsap Peninsula, and most of the city of Tacoma. Its counties include the entirety of Clallam, Kitsap, Mason, Jefferson, and Grays Harbor counties, and part of Pierce County. The 6th district has been represented in the U.S. House of Representatives by Derek Kilmer, a Democrat from Gig Harbor, since January 2013. He succeeded 36-year incumbent and fellow Democrat Norm Dicks, at the time the dean of the Washington delegation.

Tacoma is the county seat of Pierce County, Washington, United States. A port city, it is situated along Washington's Puget Sound, 32 miles (51 km) southwest of Seattle, 36 miles (58 km) southwest of Bellevue, 31 miles (50 km) northeast of the state capital, Olympia, 58 miles (93 km) northwest of Mount Rainier National Park, and 80 miles (130 km) east of Olympic National Park. The city's population was 219,346 at the time of the 2020 census. Tacoma is the second-largest city in the Puget Sound area and the third-most populous in the state. Tacoma also serves as the center of business activity for the South Sound region, which has a population of about 1 million.