Home Postcode finder WA Corinthia Corinthia postcode WA Corinthia is a locality in Western Australia covered by postcode 6426. Postcode 6426 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Corinthia business listing Be the first listing in Corinthia Common questionsWhat is the postcode for Corinthia?Corinthia, WA has the postcode 6426.What state is Corinthia in?Corinthia is in Western Australia (WA).Does postcode 6426 cover more than one suburb?Yes. Postcode 6426 covers 14 localities, so the postcode alone does not identify Corinthia. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.