For decades, Sydney was seen as Australia's largest city but the Australian Bureau of Statistics says that has now changed, as Melbourne overtakes Sydney as Australia's largest state.
The rivalry has been between Sydney and Melbourne for decades.
Sydney's population dominated Melbourne in 1902 and has remained so for over a hundred years - until now.
Melbourne has surpassed Sydney as Australia's largest city with more than five million residents.
Today, Melbourne has about 19,000 more people than Sydney, with a total of about five comma eight million.
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