rottnest-island postcode wa Home ›› Postcode Finder ›› WA ›› Rottnest-Island Rottnest Island local listingsThe suburb of Rottnest Island is located in WA and has a postcode of 6161. Free rottnest island business listing! Get the first free listing in rottnest island! Search and find other Postcodes in Western Australia or widen the search to Postcodes in Australia.