Home Postcode finder NSW Middle Brook Middle Brook postcode NSW Middle 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 Middle Brook business listing Be the first listing in Middle Brook Common questionsWhat is the postcode for Middle Brook?Middle Brook, NSW has the postcode 2337.What state is Middle Brook in?Middle 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 Middle Brook. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.