thumb|Sumner's [[Ryan House (home of the city's historical museum) is on the National Register of Historic Places.]]
thumb|Reuben Knoblauch Heritage Park near the [[Sounder commuter rail station that connects Sumner to Seattle and Tacoma]]
Sumner is a city in northern Pierce County, Washington, United States. The population was 10,621 at the 2020 census. Nearby cities include Puyallup to the west, Auburn to the north, and Bonney Lake to the east.
History
Sumner was founded in 1853 as Stuck Junction and platted in 1883 by George H. Ryan, in anticipation of a stop on the Northern Pacific Railway. The town was named "Franklin" until 1891, when the Post Office Department requested that the name be changed to avoid confusion with similarly named towns. The name of abolitionist Senator Charles Sumner was chosen for the town after a lottery.
Geography
According to the United States Census Bureau, the city has a total area of , of which is land and is water.
Sumner, along with Orting and Puyallup, lie in the lahar hazard zone for Mount Rainier. During the Osceola Mudflow, dated to approximately 5,600 years before present, a deposit covered a portion of the city's modern location.
Economy
Dillanos Coffee Roasters is based in Sumner.
REI maintains corporate offices and a large distribution center in Sumner.