Home Postcode finder NSW Killcare Heights Killcare Heights postcode NSW Killcare Heights is a locality in New South Wales covered by postcode 2257. Postcode 2257 State or territory New South Wales (NSW) Region Gosford Add a free Killcare Heights business listing Be the first listing in Killcare Heights Common questionsWhat is the postcode for Killcare Heights?Killcare Heights, NSW has the postcode 2257.What state is Killcare Heights in?Killcare Heights is in New South Wales (NSW).Does postcode 2257 cover more than one suburb?Yes. Postcode 2257 covers 12 localities, so the postcode alone does not identify Killcare Heights. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.