Home Postcode finder WA Kanowna Kanowna postcode WA Kanowna is a locality in Western Australia covered by postcode 6431. Postcode 6431 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Kanowna business listing Be the first listing in Kanowna Common questionsWhat is the postcode for Kanowna?Kanowna, WA has the postcode 6431.What state is Kanowna in?Kanowna is in Western Australia (WA).Does postcode 6431 cover more than one suburb?Yes. Postcode 6431 covers 13 localities, so the postcode alone does not identify Kanowna. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.