Home Postcode finder QLD Coulson Coulson postcode QLD Coulson is a locality in Queensland covered by postcode 4310. Postcode 4310 State or territory Queensland (QLD) Region Western Suburbs Add a free Coulson business listing Be the first listing in Coulson Common questionsWhat is the postcode for Coulson?Coulson, QLD has the postcode 4310.What state is Coulson in?Coulson is in Queensland (QLD).Does postcode 4310 cover more than one suburb?Yes. Postcode 4310 covers 26 localities, so the postcode alone does not identify Coulson. Browse other postcodes in Queensland, or widen the search to every Australian postcode.