Home Postcode finder QLD Alton Downs Alton Downs postcode QLD Alton Downs is a locality in Queensland covered by postcode 4702. Postcode 4702 State or territory Queensland (QLD) Region Central QLD Add a free Alton Downs business listing Be the first listing in Alton Downs Common questionsWhat is the postcode for Alton Downs?Alton Downs, QLD has the postcode 4702.What state is Alton Downs in?Alton Downs is in Queensland (QLD).Does postcode 4702 cover more than one suburb?Yes. Postcode 4702 covers 87 localities, so the postcode alone does not identify Alton Downs. Browse other postcodes in Queensland, or widen the search to every Australian postcode.