Home Postcode finder QLD Mount Walker Mount Walker postcode QLD Mount Walker is a locality in Queensland covered by postcode 4340. Postcode 4340 State or territory Queensland (QLD) Region Western Suburbs Add a free Mount Walker business listing Be the first listing in Mount Walker Common questionsWhat is the postcode for Mount Walker?Mount Walker, QLD has the postcode 4340.What state is Mount Walker in?Mount Walker is in Queensland (QLD).Does postcode 4340 cover more than one suburb?Yes. Postcode 4340 covers 18 localities, so the postcode alone does not identify Mount Walker. Browse other postcodes in Queensland, or widen the search to every Australian postcode.