More than $24,600 separates the wealthiest and poorest postcodes in the south-west, new taxation data shows.
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The 3273 postcode, which takes in the rural area of Hexham, had the highest taxable income in 2016-17 of $55,646 - one of only four postcodes in the region where the average taxable income was above $50,000.
The average taxable income in the 3277 postcode, which takes in Allansford and Naringal, was $51,486, the 3302 postcode of Branxholme was $51,439 and Portland's was $50,814.
The 3267 postcode which takes in Scotts Creek had the lowest taxable income in the south-west of $31,044.
However, it was an improvement on the 2012-13 financial year where its taxable average of $22,453 put it in the lowest bracket in the country.
The statistics are an average of taxable income of the entire workforce and includes both full-time and part-timers.
Moyne Shire mayor Mick Wolfe said he was unsure why Hexham topped the list, but council put it down to a handful of major farming landholdings within the postcode.
"There's no big industry or anything like that, no gold mines, no nothing," Cr Wolfe said.
Warrnambool's average taxable income was $48,145, a jump of 9.5 per cent since 2012-13, while Hamilton's average taxable income was $45,204.
Aside from Scotts Creek, Hexham, Allansford, Branxholme and Portland, all other postcodes in the south-west had an average taxable income of between $40,000 and $50,000.
Port Campbell, Grassmere, Port Fairy and Yambuk and Orford all had average taxable income between $49,000 and $50,000.
To see how much your postcode earns click here.
Nationwide there was a difference $209,741 in average income between the richest postcode and poorest postcodes.
The poorest postcode in Australia was in New South Wales where the average taxable income was $20,589, while Victoria's lowest postcode was in the Wimmera where the average taxable income was $24,346.
The highest average taxable income of $230,330 was in the Sydney suburbs that include Palm Beach.
Melbourne's 3142 postcode, covering Toorak and Hawksburn, was the second highest with an average taxable income of $193,904.
Medical practitioners dominated the highest earning occupations, with surgeons posting the biggest average incomes with a national average taxable income of $394,866.
Fast-food cooks were the lowest earners (average income $18,616), followed by hospitality employee ($19,102), hospitality apprentice or trainee ($19,282), farm, forestry or garden worker apprentice or trainee ($19,744), and farmer ($22,378).
Australia continues to be a charitable nation. In total, Australians reported donating $3.5 billion with an average gift size, for those who did donate, of $770.
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