Home Postcode finder NSW Castle Doyle Castle Doyle postcode NSW Castle Doyle is a locality in New South Wales covered by postcode 2350. Postcode 2350 State or territory New South Wales (NSW) Region NSW North Coast Add a free Castle Doyle business listing Be the first listing in Castle Doyle Common questionsWhat is the postcode for Castle Doyle?Castle Doyle, NSW has the postcode 2350.What state is Castle Doyle in?Castle Doyle is in New South Wales (NSW).Does postcode 2350 cover more than one suburb?Yes. Postcode 2350 covers 25 localities, so the postcode alone does not identify Castle Doyle. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.