Home Postcode finder NSW Backwater Backwater postcode NSW Backwater is a locality in New South Wales covered by postcode 2365. Postcode 2365 State or territory New South Wales (NSW) Region NSW North Coast Add a free Backwater business listing Be the first listing in Backwater Common questionsWhat is the postcode for Backwater?Backwater, NSW has the postcode 2365.What state is Backwater in?Backwater is in New South Wales (NSW).Does postcode 2365 cover more than one suburb?Yes. Postcode 2365 covers 26 localities, so the postcode alone does not identify Backwater. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.