Home Postcode finder WA Welbungin Welbungin postcode WA Welbungin is a locality in Western Australia covered by postcode 6477. Postcode 6477 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Welbungin business listing Be the first listing in Welbungin Common questionsWhat is the postcode for Welbungin?Welbungin, WA has the postcode 6477.What state is Welbungin in?Welbungin is in Western Australia (WA).Does postcode 6477 cover more than one suburb?Yes. Postcode 6477 covers 2 localities, so the postcode alone does not identify Welbungin. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.