Aussiegeo

Geolocation modules for Australia.
included modules:
- aussie geofield proximity (actually just geofield proximity with bugs fixed)
- aussie postcodes: provides a form type called 'aussie_postcodes' which is an autocomplete textfield for aussie postcodes and suburbs.

If your looking for an Australian postcode module, I have created a full module at: https://www.drupal.org/project/oz_postcodes

The proximity module is not very good and was/is a temporary solution for my own sites until a stable release of geofield proximity is released.