Home Postcode finder QLD Rosslyn Rosslyn postcode QLD Rosslyn is a locality in Queensland covered by postcode 4703. Postcode 4703 State or territory Queensland (QLD) Region Central QLD Add a free Rosslyn business listing Be the first listing in Rosslyn Common questionsWhat is the postcode for Rosslyn?Rosslyn, QLD has the postcode 4703.What state is Rosslyn in?Rosslyn is in Queensland (QLD).Does postcode 4703 cover more than one suburb?Yes. Postcode 4703 covers 30 localities, so the postcode alone does not identify Rosslyn. Browse other postcodes in Queensland, or widen the search to every Australian postcode.