Home Postcode finder NSW Mount Rivers Mount Rivers postcode NSW Mount Rivers is a locality in New South Wales covered by postcode 2311. Postcode 2311 State or territory New South Wales (NSW) Region Hunter Add a free Mount Rivers business listing Be the first listing in Mount Rivers Common questionsWhat is the postcode for Mount Rivers?Mount Rivers, NSW has the postcode 2311.What state is Mount Rivers in?Mount Rivers is in New South Wales (NSW).Does postcode 2311 cover more than one suburb?Yes. Postcode 2311 covers 11 localities, so the postcode alone does not identify Mount Rivers. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.