Home Postcode finder QLD Wynnum Plaza Wynnum Plaza postcode QLD Wynnum Plaza is a locality in Queensland covered by postcode 4178. Postcode 4178 State or territory Queensland (QLD) Region Brisbane Central Add a free Wynnum Plaza business listing Be the first listing in Wynnum Plaza Common questionsWhat is the postcode for Wynnum Plaza?Wynnum Plaza, QLD has the postcode 4178.What state is Wynnum Plaza in?Wynnum Plaza is in Queensland (QLD).Does postcode 4178 cover more than one suburb?Yes. Postcode 4178 covers 6 localities, so the postcode alone does not identify Wynnum Plaza. Browse other postcodes in Queensland, or widen the search to every Australian postcode.