Auburn is a city in King County, Washington and additionally Pierce County, Washington, United States; with the majority of spatial land area within King County. The population was 70,180 at the 2010 United States Census. Auburn is a suburb in the Seattle metropolitan area. Auburn is currently ranked the fourteenth largest city in the state of Washington.
Auburn is bordered by the cities of Federal Way, Pacific, and Algona to the west, Sumner to the south, Kent to the north, and unincorporated King County to the east. The Muckleshoot Indian Reservation is located within southern city limits.