Derby is a town in the Kimberley region of Western Australia. At the 2016 census, Derby had a population of 3,325 with 47.2% of Aboriginal an…Derby is a town in the Kimberley region of Western Australia. At the 2016 census, Derby had a population of 3,325 with 47.2% of Aboriginal and Torres Strait Islander descent. Along with Broome and Kununurra, it is one of only three towns in the Kimberley to have a population over 2,000. Located on King Sound, Derby has the highest tides in Australia, with the differential between low and high tide reaching 11.8 metres.