Home Postcode finder WA Mount Stirling Mount Stirling postcode WA Mount Stirling is a locality in Western Australia covered by postcode 6383. Postcode 6383 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Mount Stirling business listing Be the first listing in Mount Stirling Common questionsWhat is the postcode for Mount Stirling?Mount Stirling, WA has the postcode 6383.What state is Mount Stirling in?Mount Stirling is in Western Australia (WA).Does postcode 6383 cover more than one suburb?Yes. Postcode 6383 covers 11 localities, so the postcode alone does not identify Mount Stirling. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.