Boulder is just 4k from the Kalgoorlie PO, but for people from Boulder are without doubt Boudlerites and that other town could be a thousand miles away. Boulder like its sister is its own entity, and is not a suburb of Kalgoorlie. The town is a mining town.
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. After the merger Boulder officially became a, suburb of Kalgoorlie, but tell that to a local
On the 20th of April 2010 Kalgoorlie-Boulder suffered a magnitude 5.0 earthquake which damaged several of the historic buildings in Boulder. The buildings are being repaired but will give an opportunity to boost the heritage factors in the town.