Home Postcode finder WA Cascade Cascade postcode WA Cascade is a locality in Western Australia covered by postcode 6450. Postcode 6450 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Cascade business listing More business listings in Cascade Businesses in CascadeCascade Primary SchoolLot 50 Asha Court · 08 90792061 Common questionsWhat is the postcode for Cascade?Cascade, WA has the postcode 6450.What state is Cascade in?Cascade is in Western Australia (WA).Does postcode 6450 cover more than one suburb?Yes. Postcode 6450 covers 23 localities, so the postcode alone does not identify Cascade. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.