Home Postcode finder WA Kirk Rock Kirk Rock postcode WA Kirk Rock is a locality in Western Australia covered by postcode 6370. Postcode 6370 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Kirk Rock business listing Be the first listing in Kirk Rock Common questionsWhat is the postcode for Kirk Rock?Kirk Rock, WA has the postcode 6370.What state is Kirk Rock in?Kirk Rock is in Western Australia (WA).Does postcode 6370 cover more than one suburb?Yes. Postcode 6370 covers 5 localities, so the postcode alone does not identify Kirk Rock. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.