Home Postcode finder WA Morbinning Morbinning postcode WA Morbinning is a locality in Western Australia covered by postcode 6304. Postcode 6304 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Morbinning business listing Be the first listing in Morbinning Common questionsWhat is the postcode for Morbinning?Morbinning, WA has the postcode 6304.What state is Morbinning in?Morbinning is in Western Australia (WA).Does postcode 6304 cover more than one suburb?Yes. Postcode 6304 covers 7 localities, so the postcode alone does not identify Morbinning. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.