Home Postcode finder QLD Topaz Topaz postcode QLD Topaz is a locality in Queensland covered by postcode 4885. Postcode 4885 State or territory Queensland (QLD) Region North QLD Add a free Topaz business listing Be the first listing in Topaz Common questionsWhat is the postcode for Topaz?Topaz, QLD has the postcode 4885.What state is Topaz in?Topaz is in Queensland (QLD).Does postcode 4885 cover more than one suburb?Yes. Postcode 4885 covers 9 localities, so the postcode alone does not identify Topaz. Browse other postcodes in Queensland, or widen the search to every Australian postcode.