Home Postcode finder WA West Casuarinas West Casuarinas postcode WA West Casuarinas is a locality in Western Australia covered by postcode 6630. Postcode 6630 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free West Casuarinas business listing Be the first listing in West Casuarinas Common questionsWhat is the postcode for West Casuarinas?West Casuarinas, WA has the postcode 6630.What state is West Casuarinas in?West Casuarinas is in Western Australia (WA).Does postcode 6630 cover more than one suburb?Yes. Postcode 6630 covers 8 localities, so the postcode alone does not identify West Casuarinas. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.