Home Postcode finder QLD Wallumbilla South Wallumbilla South postcode QLD Wallumbilla South is a locality in Queensland covered by postcode 4428. Postcode 4428 State or territory Queensland (QLD) Region Toowoomba Region Add a free Wallumbilla South business listing Be the first listing in Wallumbilla South Common questionsWhat is the postcode for Wallumbilla South?Wallumbilla South, QLD has the postcode 4428.What state is Wallumbilla South in?Wallumbilla South 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 South. Browse other postcodes in Queensland, or widen the search to every Australian postcode.