Home Postcode finder WA Cranbrook Cranbrook postcode WA Cranbrook is a locality in Western Australia covered by postcode 6321. Postcode 6321 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Cranbrook business listing More business listings in Cranbrook Businesses in CranbrookCranbrook Primary SchoolGrenfell St · 08 98261028 Common questionsWhat is the postcode for Cranbrook?Cranbrook, WA has the postcode 6321.What state is Cranbrook in?Cranbrook is in Western Australia (WA).Does postcode 6321 cover more than one suburb?No. Postcode 6321 covers Cranbrook only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.