Home Postcode finder NSW Halton Halton postcode NSW Halton is a locality in New South Wales covered by postcode 2311. Postcode 2311 State or territory New South Wales (NSW) Region Hunter Add a free Halton business listing Be the first listing in Halton Common questionsWhat is the postcode for Halton?Halton, NSW has the postcode 2311.What state is Halton in?Halton is in New South Wales (NSW).Does postcode 2311 cover more than one suburb?Yes. Postcode 2311 covers 11 localities, so the postcode alone does not identify Halton. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.