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is a city in King and Pierce counties (primarily in King) in the U.S. state of Washington. The population was 40,314 at the 2000 census; the State of Washington Office of Financial Management estimates the City of Auburn's population to be 67,005 as of April 1, 2008. The population increased dramatically resulting from the recent annexations of the West Hill, and Lea Hill, Washington communities directly east and west of the city. Though founded (in 1891) before either Seattle or Tacoma had suburbs, Auburn is now generally considered a suburb in the Seattle-Tacoma-Bellevue metropolitan area, while still retaining its historical downtown district. Auburn is currently ranked the 13th largest city in the state.
Auburn is roughly bordered by the cities of Federal Way, Pacific, and Algona to the west, Sumner to the south, unincorporated King County to the east, and Kent to the north. The Muckleshoot Indian Reservation is located within city limits.
According to the United States Census Bureau, the city has a total area of 21.3 mi² (55.1 km²). 21.3 mi² (55.1 km²) of it is land and 0.05% is water.
Two rivers, the White River and, to a greater extent, the Green River flow through Auburn.
Historically, the Stuck River ran through the settlement of Stuck, which is now a small pocket of unincorporated King County within southern Auburn. In 1906, the flow of the White River was diverted into the Stuck's channel near today's Game Farm Park. References to the Stuck River still appear in some property legal descriptions and place names, e.g. Stuck River Drive, within Auburn, but today it is essentially indistinguishable from the southern White River.