I have several business locations located throughout Australia with individual counts. I would like to group the counts from each location them according to postal code. However, I only have the latitude and longitude coordinates of each business. Is there a way to group the businesses based on their lon and lat into postal codes?
You're looking for something called reverse geocoding. I'm not aware of a way to do this directly in Tableau, unfortunately, but there are plenty of tools and APIs available to allow you to perform this. I found the following which seems to have this for Australia: Mappify.io - Geocoding and Routing