* Google Australia favors sites which are using .com.au domains.
* Google favors sites which are hosted within Australia, another benefit of hosting your site locally is that it will run faster.
* If you don’t have your website hosted in Australia you can use is to Geo targeted Meta data to select locations in Australia –
An Example of GEO Meta data targeting the Sydney market.
* Finally you should focus on building links from .com.au domains as Google favors link backs from these specific domains local tld’s.
I hope this information assists with ranking in Google Australia.