Home Postcodes by state WA Kalgan Kalgan postcode WA Kalgan is a locality in Western Australia covered by postcode 6330. Postcode 6330 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Kalgan business listing Be the first listing in Kalgan Common questionsWhat is the postcode for Kalgan?Kalgan, WA has the postcode 6330.What state is Kalgan in?Kalgan is in Western Australia (WA).Does postcode 6330 cover more than one suburb?Yes. Postcode 6330 covers 50 localities, so the postcode alone does not identify Kalgan. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.