Home Postcode finder WA King Leopold Ranges King Leopold Ranges postcode WA King Leopold Ranges is a locality in Western Australia covered by postcode 6728. Postcode 6728 State or territory Western Australia (WA) Region North West Suburbs Add a free King Leopold Ranges business listing Be the first listing in King Leopold Ranges Common questionsWhat is the postcode for King Leopold Ranges?King Leopold Ranges, WA has the postcode 6728.What state is King Leopold Ranges in?King Leopold Ranges is in Western Australia (WA).Does postcode 6728 cover more than one suburb?Yes. Postcode 6728 covers 8 localities, so the postcode alone does not identify King Leopold Ranges. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.