Home Postcode finder NSWDL Steeple Flat Steeple Flat postcode NSWDL Steeple Flat is a locality in New South Wales covered by postcode 2631. Postcode 2631 State or territory New South Wales (NSWDL) Region Canberra Add a free Steeple Flat business listing Be the first listing in Steeple Flat Common questionsWhat is the postcode for Steeple Flat?Steeple Flat, NSWDL has the postcode 2631.What state is Steeple Flat in?Steeple Flat is in New South Wales (NSWDL).Does postcode 2631 cover more than one suburb?Yes. Postcode 2631 covers 12 localities, so the postcode alone does not identify Steeple Flat. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.