dumaresq-island postcode nsw Home ›› Postcode Finder ›› NSW ›› Dumaresq-Island Dumaresq Island local listingsThe suburb of Dumaresq Island is located in NSW and has a postcode of 2430. Free dumaresq island business listing! Get the first free listing in dumaresq island! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.