Home Postcode finder NSW Koolewong Koolewong postcode NSW Koolewong is a locality in New South Wales covered by postcode 2256. Postcode 2256 State or territory New South Wales (NSW) Region Gosford Add a free Koolewong business listing Be the first listing in Koolewong Common questionsWhat is the postcode for Koolewong?Koolewong, NSW has the postcode 2256.What state is Koolewong in?Koolewong is in New South Wales (NSW).Does postcode 2256 cover more than one suburb?Yes. Postcode 2256 covers 10 localities, so the postcode alone does not identify Koolewong. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.