Home Postcode finder QLD Wallumbilla Wallumbilla postcode QLD Wallumbilla is a locality in Queensland covered by postcode 4428. Postcode 4428 State or territory Queensland (QLD) Region Toowoomba Region Add a free Wallumbilla business listing More business listings in Wallumbilla Businesses in WallumbillaWallumbilla State School22 High St · 07 46298888 Common questionsWhat is the postcode for Wallumbilla?Wallumbilla, QLD has the postcode 4428.What state is Wallumbilla in?Wallumbilla 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. Browse other postcodes in Queensland, or widen the search to every Australian postcode.