Auburn is a city in King and Pierce counties 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 67,485 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. The town was named Auburn on February 21, 1893, before either Seattle or Tacoma had suburbs, Auburn is now generally considered a suburb in the Seattle-Tacoma-Bellevue metropolitan area. Auburn is currently ranked the 13th largest city in the state of Washington. 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.