Home Postcodes by state WA Wialki Wialki postcode WA Wialki is a locality in Western Australia covered by postcode 6473. Postcode 6473 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Wialki business listing Be the first listing in Wialki Common questionsWhat is the postcode for Wialki?Wialki, WA has the postcode 6473.What state is Wialki in?Wialki is in Western Australia (WA).Does postcode 6473 cover more than one suburb?Yes. Postcode 6473 covers 2 localities, so the postcode alone does not identify Wialki. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.