Home Postcode finder QLD Cairns City Cairns City postcode QLD Cairns City is a locality in Queensland covered by postcode 4870. Postcode 4870 State or territory Queensland (QLD) Region North QLD Add a free Cairns City business listing More business listings in Cairns City Businesses in Cairns CityCairns Plastic Surgery3-5 Upward Street, Cairns City QLD 4870, Australia · (07) 4031 5755Cairns Tree LoppersCairns City QLD, Australia · (07) 4847 6708Forresters Cleaning Services14 Spence Street · +61 459 755 555 Common questionsWhat is the postcode for Cairns City?Cairns City, QLD has the postcode 4870.What state is Cairns City in?Cairns City 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 City. Browse other postcodes in Queensland, or widen the search to every Australian postcode.