osmington postcode wa Home ›› Postcode Finder ›› WA ›› Osmington Osmington local listingsThe suburb of Osmington is located in WA and has a postcode of 6285. Free osmington business listing! 1Soil Dynamics805 Osmington Rd, Osmington WA 6285, Australia 0491 106 946 View more business listings in osmington Search and find other Postcodes in Western Australia or widen the search to Postcodes in Australia.