Home Postcode finder NSW Mallan Mallan postcode NSW Mallan is a locality in New South Wales covered by postcode 2734. Postcode 2734 State or territory New South Wales (NSW) Region Vic Far Country Add a free Mallan business listing Be the first listing in Mallan Common questionsWhat is the postcode for Mallan?Mallan, NSW has the postcode 2734.What state is Mallan in?Mallan is in New South Wales (NSW).Does postcode 2734 cover more than one suburb?Yes. Postcode 2734 covers 9 localities, so the postcode alone does not identify Mallan. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.