Home Postcode finder QLD Silverdale Silverdale postcode QLD Silverdale is a locality in Queensland covered by postcode 4307. Postcode 4307 State or territory Queensland (QLD) Region Western Suburbs Add a free Silverdale business listing Be the first listing in Silverdale Common questionsWhat is the postcode for Silverdale?Silverdale, QLD has the postcode 4307.What state is Silverdale in?Silverdale is in Queensland (QLD).Does postcode 4307 cover more than one suburb?Yes. Postcode 4307 covers 7 localities, so the postcode alone does not identify Silverdale. Browse other postcodes in Queensland, or widen the search to every Australian postcode.