Home Postcode finder NSW Duncans Creek Duncans Creek postcode NSW Duncans Creek is a locality in New South Wales covered by postcode 2340. Postcode 2340 State or territory New South Wales (NSW) Region NSW North Coast Add a free Duncans Creek business listing Be the first listing in Duncans Creek Common questionsWhat is the postcode for Duncans Creek?Duncans Creek, NSW has the postcode 2340.What state is Duncans Creek in?Duncans Creek is in New South Wales (NSW).Does postcode 2340 cover more than one suburb?Yes. Postcode 2340 covers 39 localities, so the postcode alone does not identify Duncans Creek. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.