The 2011 Australian Census data by the Australian Bureau of Statistics shows that 24.6 per cent of Australians were not born here, while 43.1 per cent have at least one overseas-born parent.
The UK is the main country of birth outside Australia, accounting for 20.8 per cent of the population who were born overseas.
New Zealand took second place with 9.1 per cent
Census Executive director Andrew Henderson said that Australia is evidently a multi-cultural destination for those in search of a better standard of living.
According to the Australian Bureau of Statistics (ABS) a total of 89,911 people living in Australia listed Ireland or Northern Ireland as their country of birth on census forms collected on August 9 2011
67,316 people listed the Republic of Ireland as their country of birth, and 22,595 residents in Australia listed Northern Ireland as their country of birth.
A total of 2.08 million people said that Ireland was their most common country of ancestry when surveyed.