Home Postcode finder WA Throssell Throssell postcode WA Throssell is a locality in Western Australia covered by postcode 6401. Postcode 6401 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Throssell business listing Be the first listing in Throssell Common questionsWhat is the postcode for Throssell?Throssell, WA has the postcode 6401.What state is Throssell in?Throssell is in Western Australia (WA).Does postcode 6401 cover more than one suburb?Yes. Postcode 6401 covers 18 localities, so the postcode alone does not identify Throssell. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.