Home Postcode finder WA Harrismith Harrismith postcode WA Harrismith is a locality in Western Australia covered by postcode 6361. Postcode 6361 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Harrismith business listing Be the first listing in Harrismith Common questionsWhat is the postcode for Harrismith?Harrismith, WA has the postcode 6361.What state is Harrismith in?Harrismith is in Western Australia (WA).Does postcode 6361 cover more than one suburb?Yes. Postcode 6361 covers 2 localities, so the postcode alone does not identify Harrismith. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.