gwambygine postcode wa Home ›› Postcode Finder ›› WA ›› Gwambygine Gwambygine local listingsThe suburb of Gwambygine is located in WA and has a postcode of 6302. Free gwambygine business listing! Get the first free listing in gwambygine! Search and find other Postcodes in Western Australia or widen the search to Postcodes in Australia.