Slaughter was incorporated on June 13, 1891, but its name was changed two years later to Auburn on February 21, 1893, by an act of the state legislature.
In 2008, Auburn annexed the West Hill and Lea Hill neighbourhoods of unincorporated King County, adding 15,000 residents and expanding its land area by 26 per cent
The city has a total area of 29.89 square miles, of which 29.62 square miles is land and 0.27 square miles is water.
The estimated population of Auburn is 87,256, as of 2020.
Auburn is twinned with the following sister cities Tamba, Japan; Pyeongchang, South Korea; Guanghan, China; Yuhang, China & Mola di Bari, Italy.
The city of Auburn was incorporated with the name Slaughter in honour of William Slaughter.
Auburn is located at 47°18’26″N 122°13’42″W (47.3073200, -122.2284500).
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 lies to the south and southeast.
Auburn is currently ranked the 13th largest city in the state of Washington.
The annual average precipitation at Auburn is 39.59 Inches.