Home Postcode finder WA Cold Harbour Cold Harbour postcode WA Cold Harbour is a locality in Western Australia covered by postcode 6302. Postcode 6302 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Cold Harbour business listing Be the first listing in Cold Harbour Common questionsWhat is the postcode for Cold Harbour?Cold Harbour, WA has the postcode 6302.What state is Cold Harbour in?Cold Harbour is in Western Australia (WA).Does postcode 6302 cover more than one suburb?Yes. Postcode 6302 covers 23 localities, so the postcode alone does not identify Cold Harbour. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.