Boulder is a suburb[2] of Kalgoorlie in the Western Australian Goldfields, 597 kilometres (371 mi) east of Perth.

The Boulder (horse) Races were a significant event in early twentieth century goldfields region history.

[6][7][8] Prior to 1989, Boulder was a town, but it was merged with Kalgoorlie to form the City of Kalgoorlie–Boulder.

[11] On 20 April 2010 Kalgoorlie-Boulder suffered a magnitude 5.0 earthquake which damaged several of the historic buildings in Boulder.

[12] During World War II, Boulder was the location of RAAF No.27 Inland Aircraft Fuel Depot, completed in 1942 and closed on 14 June 1944.