Home Postcodes by state WA North Cascade North Cascade postcode WA North Cascade is a locality in Western Australia covered by postcode 6445. Postcode 6445 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Council area Esperance Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Add a free North Cascade business listing Be the first listing in North Cascade Also in postcode 6445Salmon GumsWA 6445 Common questionsWhat is the postcode for North Cascade?North Cascade, WA has the postcode 6445.What state is North Cascade in?North Cascade is in Western Australia (WA).What council is North Cascade in?North Cascade is in the Esperance local government area.Does postcode 6445 cover more than one suburb?Yes. Postcode 6445 covers 2 localities, so the postcode alone does not identify North Cascade. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.