The City of Kalgoorlie-Boulder is a local government area in the Goldfields-Esperance region of Western Australia, about 550 kilometres (342 mi) east of the state capital, Perth. The City covers an area of 95,575 square kilometres (36,902 sq mi), and its seat of government is the town of Kalgoorlie; all but 244 of the city's population live in either Kalgoorlie or Boulder.