Home Postcode finder NSWDL Wallanbah Wallanbah postcode NSWDL Wallanbah is a locality in New South Wales covered by postcode 2422. Postcode 2422 State or territory New South Wales (NSWDL) Region Hunter Add a free Wallanbah business listing Be the first listing in Wallanbah Common questionsWhat is the postcode for Wallanbah?Wallanbah, NSWDL has the postcode 2422.What state is Wallanbah in?Wallanbah is in New South Wales (NSWDL).Does postcode 2422 cover more than one suburb?Yes. Postcode 2422 covers 45 localities, so the postcode alone does not identify Wallanbah. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.