澳洲总人口数于2007年6月29日晚9点32分58秒达到2100万。根据统计局的统计，澳洲每1分56秒一个新生儿出世，每3分59秒一人死亡，每3分15秒净增一个新移民。

AUSTRALIA's population has reached an estimated 21 million.

The milestone is thought to have been achieved about 9.32pm and 58 seconds (AEST) today, according to an online clock operated by the Australian Bureau of Statistics (ABS) that estimates the country's resident population.

The estimate calculates an increase of one person every one minute and 45 seconds by averaging one birth every one minute, 56 seconds; one death every three minutes, 59 seconds; and a net gain of one international migrant every three minutes and 15 seconds.

Australia's population passed the 20 million mark in December 2003, according to ABS data.

It was not immediately clear who was the 21 millionth Australian - a baby or a migrant - or where they might be.

The world population as of today was an estimated 6.605 billion, according to a clock kept by the US Bureau of Census.