Home Postcode finder QLD Wainui Wainui postcode QLD Wainui is a locality in Queensland covered by postcode 4404. Postcode 4404 State or territory Queensland (QLD) Region Toowoomba Region Add a free Wainui business listing Be the first listing in Wainui Common questionsWhat is the postcode for Wainui?Wainui, QLD has the postcode 4404.What state is Wainui in?Wainui is in Queensland (QLD).Does postcode 4404 cover more than one suburb?Yes. Postcode 4404 covers 4 localities, so the postcode alone does not identify Wainui. Browse other postcodes in Queensland, or widen the search to every Australian postcode.