Home Postcode finder NSW Retreat Retreat postcode NSW Retreat is a locality in New South Wales covered by postcode 2355. Postcode 2355 State or territory New South Wales (NSW) Region NSW North Coast Add a free Retreat business listing Be the first listing in Retreat Common questionsWhat is the postcode for Retreat?Retreat, NSW has the postcode 2355.What state is Retreat in?Retreat is in New South Wales (NSW).Does postcode 2355 cover more than one suburb?Yes. Postcode 2355 covers 3 localities, so the postcode alone does not identify Retreat. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.