Home Postcode finder NSW North St Marys North St Marys postcode NSW North St Marys is a locality in New South Wales covered by postcode 2760. Postcode 2760 State or territory New South Wales (NSW) Region Nepean Add a free North St Marys business listing Be the first listing in North St Marys Common questionsWhat is the postcode for North St Marys?North St Marys, NSW has the postcode 2760.What state is North St Marys in?North St Marys is in New South Wales (NSW).Does postcode 2760 cover more than one suburb?Yes. Postcode 2760 covers 7 localities, so the postcode alone does not identify North St Marys. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.