Home Postcode finder NSW Kiar Kiar postcode NSW Kiar is a locality in New South Wales covered by postcode 2259. Postcode 2259 State or territory New South Wales (NSW) Region Gosford Add a free Kiar business listing Be the first listing in Kiar Common questionsWhat is the postcode for Kiar?Kiar, NSW has the postcode 2259.What state is Kiar in?Kiar is in New South Wales (NSW).Does postcode 2259 cover more than one suburb?Yes. Postcode 2259 covers 42 localities, so the postcode alone does not identify Kiar. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.