Home Postcode finder WA Dumberning Dumberning postcode WA Dumberning is a locality in Western Australia covered by postcode 6312. Postcode 6312 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Dumberning business listing Be the first listing in Dumberning Common questionsWhat is the postcode for Dumberning?Dumberning, WA has the postcode 6312.What state is Dumberning in?Dumberning is in Western Australia (WA).Does postcode 6312 cover more than one suburb?Yes. Postcode 6312 covers 9 localities, so the postcode alone does not identify Dumberning. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.