Home Postcode finder NSW Wallarobba Wallarobba postcode NSW Wallarobba is a locality in New South Wales covered by postcode 2420. Postcode 2420 State or territory New South Wales (NSW) Region Hunter Add a free Wallarobba business listing Be the first listing in Wallarobba Common questionsWhat is the postcode for Wallarobba?Wallarobba, NSW has the postcode 2420.What state is Wallarobba in?Wallarobba is in New South Wales (NSW).Does postcode 2420 cover more than one suburb?Yes. Postcode 2420 covers 23 localities, so the postcode alone does not identify Wallarobba. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.