Home Postcode finder WA Trafalgar Trafalgar postcode WA Trafalgar is a locality in Western Australia covered by postcode 6431. Postcode 6431 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Trafalgar business listing Be the first listing in Trafalgar Common questionsWhat is the postcode for Trafalgar?Trafalgar, WA has the postcode 6431.What state is Trafalgar in?Trafalgar is in Western Australia (WA).Does postcode 6431 cover more than one suburb?Yes. Postcode 6431 covers 13 localities, so the postcode alone does not identify Trafalgar. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.