Home Postcode finder QLD Wallumbilla North Wallumbilla North postcode QLD Wallumbilla North is a locality in Queensland covered by postcode 4428. Postcode 4428 State or territory Queensland (QLD) Region Toowoomba Region Add a free Wallumbilla North business listing Be the first listing in Wallumbilla North Common questionsWhat is the postcode for Wallumbilla North?Wallumbilla North, QLD has the postcode 4428.What state is Wallumbilla North in?Wallumbilla North is in Queensland (QLD).Does postcode 4428 cover more than one suburb?Yes. Postcode 4428 covers 4 localities, so the postcode alone does not identify Wallumbilla North. Browse other postcodes in Queensland, or widen the search to every Australian postcode.