st-marys-south postcode nsw Home ›› Postcode Finder ›› NSW ›› St-Marys-South St Marys South local listingsThe suburb of St Marys South is located in NSW and has a postcode of 2760. Free st marys south business listing! Get the first free listing in st marys south! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.