Home Postcode finder QLD Southern Cross Southern Cross postcode QLD Southern Cross is a locality in Queensland covered by postcode 4820. Postcode 4820 State or territory Queensland (QLD) Region North QLD Add a free Southern Cross business listing Be the first listing in Southern Cross Common questionsWhat is the postcode for Southern Cross?Southern Cross, QLD has the postcode 4820.What state is Southern Cross in?Southern Cross is in Queensland (QLD).Does postcode 4820 cover more than one suburb?Yes. Postcode 4820 covers 21 localities, so the postcode alone does not identify Southern Cross. Browse other postcodes in Queensland, or widen the search to every Australian postcode.