Upmarket residents of Peppermint Grove and Cottesloe enjoy the second-highest incomes in the country.
Australian Taxation Office figures, to be released today, show 5200 individuals in the 6011 postcode earned an average taxable income of almost $180,000 in 2011-12.
It put the area only behind the eastern Sydney wealth enclave of Edgecliff and Point Piper where the mean taxable income was $210,733. In the previous year's figures, Peppermint Grove and Cottesloe were ranked the seventh best-paid suburbs in the country.
At the other end of the income tree, the lowest average incomes in WA were again registered in Karlgarin. Incomes there lifted 15 per cent to $44,232.