Zip Code - 4 numbers?

Hey guys,
Hope you are well! I just set up another club, and when putting in the zip code, 5 digits are mandatory.
In Australia, our zip (postal) codes are only 4 numbers.
Thought it might cause some confusion with maps to locate clubs, matches & events.

Would it possible to have zip codes less than 5 digits?

Cheers
Adam

I’ll have the web guys look at this today.