Home Postcode finder NSW Marshdale Marshdale postcode NSW Marshdale is a locality in New South Wales covered by postcode 2420. Postcode 2420 State or territory New South Wales (NSW) Region Hunter Add a free Marshdale business listing Be the first listing in Marshdale Common questionsWhat is the postcode for Marshdale?Marshdale, NSW has the postcode 2420.What state is Marshdale in?Marshdale is in New South Wales (NSW).Does postcode 2420 cover more than one suburb?Yes. Postcode 2420 covers 23 localities, so the postcode alone does not identify Marshdale. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.