Home Postcode finder NSWDL Diehard Diehard postcode NSWDL Diehard is a locality in New South Wales covered by postcode 2370. Postcode 2370 State or territory New South Wales (NSWDL) Region NSW North Coast Add a free Diehard business listing Be the first listing in Diehard Common questionsWhat is the postcode for Diehard?Diehard, NSWDL has the postcode 2370.What state is Diehard in?Diehard is in New South Wales (NSWDL).Does postcode 2370 cover more than one suburb?Yes. Postcode 2370 covers 24 localities, so the postcode alone does not identify Diehard. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.