Home Postcode finder NSW Butterwick Butterwick postcode NSW Butterwick is a locality in New South Wales covered by postcode 2321. Postcode 2321 State or territory New South Wales (NSW) Region Hunter Add a free Butterwick business listing Be the first listing in Butterwick Common questionsWhat is the postcode for Butterwick?Butterwick, NSW has the postcode 2321.What state is Butterwick in?Butterwick is in New South Wales (NSW).Does postcode 2321 cover more than one suburb?Yes. Postcode 2321 covers 20 localities, so the postcode alone does not identify Butterwick. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.