Home Postcode finder QLD Cynthia Cynthia postcode QLD Cynthia is a locality in Queensland covered by postcode 4627. Postcode 4627 State or territory Queensland (QLD) Region Sunshine Coast Add a free Cynthia business listing Be the first listing in Cynthia Common questionsWhat is the postcode for Cynthia?Cynthia, QLD has the postcode 4627.What state is Cynthia in?Cynthia is in Queensland (QLD).Does postcode 4627 cover more than one suburb?Yes. Postcode 4627 covers 10 localities, so the postcode alone does not identify Cynthia. Browse other postcodes in Queensland, or widen the search to every Australian postcode.