Home Postcode finder QLD Arcadia Arcadia postcode QLD Arcadia is a locality in Queensland covered by postcode 4819. Postcode 4819 State or territory Queensland (QLD) Region North QLD Add a free Arcadia business listing Be the first listing in Arcadia Common questionsWhat is the postcode for Arcadia?Arcadia, QLD has the postcode 4819.What state is Arcadia in?Arcadia is in Queensland (QLD).Does postcode 4819 cover more than one suburb?Yes. Postcode 4819 covers 7 localities, so the postcode alone does not identify Arcadia. Browse other postcodes in Queensland, or widen the search to every Australian postcode.