Home Postcode finder WA Crossman Crossman postcode WA Crossman is a locality in Western Australia covered by postcode 6390. Postcode 6390 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Crossman business listing Be the first listing in Crossman Common questionsWhat is the postcode for Crossman?Crossman, WA has the postcode 6390.What state is Crossman in?Crossman is in Western Australia (WA).Does postcode 6390 cover more than one suburb?Yes. Postcode 6390 covers 11 localities, so the postcode alone does not identify Crossman. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.