To find out which federal electorate you live in, you can use the search function on the Australian Electoral Commission (AEC) website. Follow these steps:

1. Go to the AEC website.
2. Click on "Electorate Search" on the homepage.
3. Enter your criteria, such as your locality, postcode, or name, in the search bar.
4. Select your search criteria from the drop-down menu.
5. Click on the "Search" button.

The search results will show you which federal electorate you live in, as well as a profile and map of your electorate and the name of the incumbent House of Representatives member. If your locality or postcode is in more than one federal electorate, you should contact the AEC to confirm which electorate you live in.