Home Postcode finder NSW Moonan Brook Moonan Brook postcode NSW Moonan Brook is a locality in New South Wales covered by postcode 2337. Postcode 2337 State or territory New South Wales (NSW) Region Hunter Add a free Moonan Brook business listing Be the first listing in Moonan Brook Common questionsWhat is the postcode for Moonan Brook?Moonan Brook, NSW has the postcode 2337.What state is Moonan Brook in?Moonan Brook is in New South Wales (NSW).Does postcode 2337 cover more than one suburb?Yes. Postcode 2337 covers 25 localities, so the postcode alone does not identify Moonan Brook. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.