Home Postcode finder WA Kwelkan Kwelkan postcode WA Kwelkan is a locality in Western Australia covered by postcode 6490. Postcode 6490 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Kwelkan business listing Be the first listing in Kwelkan Common questionsWhat is the postcode for Kwelkan?Kwelkan, WA has the postcode 6490.What state is Kwelkan in?Kwelkan is in Western Australia (WA).Does postcode 6490 cover more than one suburb?Yes. Postcode 6490 covers 6 localities, so the postcode alone does not identify Kwelkan. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.