Home Postcode finder WA Osmington Osmington postcode WA Osmington is a locality in Western Australia covered by postcode 6285. Postcode 6285 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Osmington business listing More business listings in Osmington Businesses in OsmingtonSoil Dynamics805 Osmington Rd, Osmington WA 6285, Australia · 0491 106 946 Common questionsWhat is the postcode for Osmington?Osmington, WA has the postcode 6285.What state is Osmington in?Osmington is in Western Australia (WA).Does postcode 6285 cover more than one suburb?Yes. Postcode 6285 covers 9 localities, so the postcode alone does not identify Osmington. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.