Home Postcode finder NSW Rocky Plain Rocky Plain postcode NSW Rocky Plain is a locality in New South Wales covered by postcode 2628. Postcode 2628 State or territory New South Wales (NSW) Region Canberra Add a free Rocky Plain business listing Be the first listing in Rocky Plain Common questionsWhat is the postcode for Rocky Plain?Rocky Plain, NSW has the postcode 2628.What state is Rocky Plain in?Rocky Plain is in New South Wales (NSW).Does postcode 2628 cover more than one suburb?Yes. Postcode 2628 covers 14 localities, so the postcode alone does not identify Rocky Plain. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.