Early European settlement in Australia almost eradicated the indigenous languages, and few of these aboriginal languages have survived today.
The 2011 analysis of language spoken at home indicate that majority of Australians speak English only as compared to non-English Speakers. Overall about 76.8% of the people speak English only, 18.2% are non-English speakers.
Apart from English, Mandarin is the dominant language spoken at home by 1.6% (336,178 people) speakers. Other emerging languages include Punjabi, Filipino/Tagalog, and Arabic.
Sydney, Australia’s most multicultural city, records about 30% of the population do not speak the English language at home. Sydney and Melbourne house more than 65% of non-English migrants who in general speak some 240 foreign languages. Many immigrants use their mother tongue and have smattering English. As a result, about 1 million migrants cannot speak English which is a huge number especially in a country of about 20 million people out of which 15% (3 million) residents speak a second language at home.

:yea: https://www.worldatlas.com/articles/what-languages-are-spoken-in-australia.html