Home Postcode finder QLD Columbia Columbia postcode QLD Columbia is a locality in Queensland covered by postcode 4820. Postcode 4820 State or territory Queensland (QLD) Region North QLD Add a free Columbia business listing Be the first listing in Columbia Common questionsWhat is the postcode for Columbia?Columbia, QLD has the postcode 4820.What state is Columbia in?Columbia 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 Columbia. Browse other postcodes in Queensland, or widen the search to every Australian postcode.