Home Postcode finder WA Irishtown Irishtown postcode WA Irishtown 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 Irishtown business listing Be the first listing in Irishtown Common questionsWhat is the postcode for Irishtown?Irishtown, WA has the postcode 6401.What state is Irishtown in?Irishtown 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 Irishtown. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.