Boulder was a town in the Western Australian goldfields 595 kilometres (369.7 mi) east of Perth

Perth, Western Australia

Perth is the capital and largest city of the Australian state of Western Australia and the fourth most populous city in Australia. The Perth metropolitan area has an estimated population of almost 1,700,000....

 and bordering onto the town of Kalgoorlie

Kalgoorlie, Western Australia

Kalgoorlie, known as Kalgoorlie-Boulder, is a town in the Goldfields-Esperance region of Western Australia, and is located east-northeast of state capital Perth at the end of the Great Eastern Highway...

 in the Eastern Goldfields

Eastern Goldfields

The Eastern Goldfields is a figurative area used in speech to describe a region of Western Australia.-Name:The name is derived in two parts from, Eastern in relation to its location from Perth and Goldfields as the name suggests comes from the mining of Gold in the region...

 region. Until 1989 it was part of its own municipality. In 1989 the towns of Kalgoorlie and Boulder were merged to form the City of Kalgoorlie-Boulder

City of Kalgoorlie-Boulder

The City of Kalgoorlie-Boulder is a Local Government Area in the Goldfields-Esperance region of Western Australia, about east of the state capital, Perth. The City covers an area of , and its seat of government is the town of Kalgoorlie; all but 244 of the city's population live either in...

. After the merger Boulder officially became a suburb of Kalgoorlie.

At the 2006 census

Census in Australia

The Australian census is administered once every five years by the Australian Bureau of Statistics. The most recent census was conducted on 9 August 2011; the next will be conducted in 2016. Prior to the introduction of regular censuses in 1961, they had also been run in 1901, 1911, 1921, 1933,...

, Boulder had a population of 5,178.

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