Home Postcode finder NSW Rock Flat Rock Flat postcode NSW Rock 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 Rock Flat business listing Be the first listing in Rock Flat Common questionsWhat is the postcode for Rock Flat?Rock Flat, NSW has the postcode 2630.What state is Rock Flat in?Rock 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 Rock Flat. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.