Home Postcode finder NSW Garthowen Garthowen postcode NSW Garthowen is a locality in New South Wales covered by postcode 2345. Postcode 2345 State or territory New South Wales (NSW) Region NSW North Coast Add a free Garthowen business listing Be the first listing in Garthowen Common questionsWhat is the postcode for Garthowen?Garthowen, NSW has the postcode 2345.What state is Garthowen in?Garthowen is in New South Wales (NSW).Does postcode 2345 cover more than one suburb?Yes. Postcode 2345 covers 2 localities, so the postcode alone does not identify Garthowen. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.