Home Postcode finder NSW Hilldale Hilldale postcode NSW Hilldale 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 Hilldale business listing Be the first listing in Hilldale Common questionsWhat is the postcode for Hilldale?Hilldale, NSW has the postcode 2420.What state is Hilldale in?Hilldale 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 Hilldale. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.