Home Postcode finder WA Kurnalpi Kurnalpi postcode WA Kurnalpi 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 Kurnalpi business listing Be the first listing in Kurnalpi Common questionsWhat is the postcode for Kurnalpi?Kurnalpi, WA has the postcode 6431.What state is Kurnalpi in?Kurnalpi 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 Kurnalpi. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.