Home Postcode finder NSW Middle Flat Middle Flat postcode NSW Middle Flat is a locality in New South Wales covered by postcode 2630. Postcode 2630 State or territory New South Wales (NSW) Region Canberra Add a free Middle Flat business listing Be the first listing in Middle Flat Common questionsWhat is the postcode for Middle Flat?Middle Flat, NSW has the postcode 2630.What state is Middle Flat in?Middle Flat is in New South Wales (NSW).Does postcode 2630 cover more than one suburb?Yes. Postcode 2630 covers 39 localities, so the postcode alone does not identify Middle Flat. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.