* The national population grew by two million people to 25.4 million since the previous census in 2016

* Millennials (born 1981-1996) are hot on the heels of baby boomers (born 1946-1964) as the largest generation, both sitting at 21.5 per cent of the population

* More than a million migrants arrived in Australia from 2016 to 2021, with 83 per cent of those arriving before the start of the pandemic

* More than 50 per cent of Australian residents are born overseas or have a parent born overseas

* There was a 25 per cent increase in the Indigenous population since the last census

* Australia has more than a million single-parent families

* More than eight million people have a long-term health condition

* More than 580,000 people have served or are currently serving in the Australian Defence Force

* More than 40 per cent identify as Christian, but that figure has dropped from 61 per cent in 2011

* The number of people who don't identify with a religion has increased from 22 per cent in 2011 to 38.9 per cent in 2021

* There are almost 11 million private dwellings across the nation, an increase of 950,000 since the last census.

Australian Associated Press