Home Postcode finder QLD Calcium Calcium postcode QLD Calcium is a locality in Queensland covered by postcode 4816. Postcode 4816 State or territory Queensland (QLD) Region North QLD Add a free Calcium business listing Be the first listing in Calcium Common questionsWhat is the postcode for Calcium?Calcium, QLD has the postcode 4816.What state is Calcium in?Calcium is in Queensland (QLD).Does postcode 4816 cover more than one suburb?Yes. Postcode 4816 covers 40 localities, so the postcode alone does not identify Calcium. Browse other postcodes in Queensland, or widen the search to every Australian postcode.