Home Postcode finder QLD Portsmith Portsmith postcode QLD Portsmith is a locality in Queensland covered by postcode 4870. Postcode 4870 State or territory Queensland (QLD) Region North QLD Add a free Portsmith business listing More business listings in Portsmith Businesses in PortsmithAlpha Cool1 Redden Street Portsmith · 1300 325 742cairns car mechanicsKnight Street, Portsmith QLD 4870, Australia · 0482 077 375Edge Marine Group11 Redden Street · (07) 4019 2100 Common questionsWhat is the postcode for Portsmith?Portsmith, QLD has the postcode 4870.What state is Portsmith in?Portsmith 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 Portsmith. Browse other postcodes in Queensland, or widen the search to every Australian postcode.