Home Postcode finder QLD Seisia Seisia postcode QLD Seisia is a locality in Queensland covered by postcode 4876. Postcode 4876 State or territory Queensland (QLD) Region North QLD Add a free Seisia business listing Be the first listing in Seisia Common questionsWhat is the postcode for Seisia?Seisia, QLD has the postcode 4876.What state is Seisia in?Seisia is in Queensland (QLD).Does postcode 4876 cover more than one suburb?Yes. Postcode 4876 covers 5 localities, so the postcode alone does not identify Seisia. Browse other postcodes in Queensland, or widen the search to every Australian postcode.