Home Postcode finder WA Murchison Murchison postcode WA Murchison is a locality in Western Australia covered by postcode 6630. Postcode 6630 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Murchison business listing Be the first listing in Murchison Common questionsWhat is the postcode for Murchison?Murchison, WA has the postcode 6630.What state is Murchison in?Murchison is in Western Australia (WA).Does postcode 6630 cover more than one suburb?Yes. Postcode 6630 covers 8 localities, so the postcode alone does not identify Murchison. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.