Home Postcode finder QLD Cairns Cairns postcode QLD Cairns is a locality in Queensland covered by postcode 4870. Postcode 4870 State or territory Queensland (QLD) Region North QLD Add a free Cairns business listing More business listings in Cairns Businesses in Cairns181 The Esplanade181 The Esplanade · (07) 4052 6888Accommodation In Cairns Australia157 Sheridan Street · +61 7 4051 3555Adventure Waters Pty LtdCnr of Dillon Road and Captain Cook Highway Barron · +613 8644 4000 Common questionsWhat is the postcode for Cairns?Cairns, QLD has the postcode 4870.What state is Cairns in?Cairns is in Queensland (QLD).Does postcode 4870 cover more than one suburb?Yes. Postcode 4870 covers 26 localities, so the postcode alone does not identify Cairns. Browse other postcodes in Queensland, or widen the search to every Australian postcode.