Home Postcode finder QLD Lower Mount Walker Lower Mount Walker postcode QLD Lower Mount Walker is a locality in Queensland covered by postcode 4340. Postcode 4340 State or territory Queensland (QLD) Region Western Suburbs Add a free Lower Mount Walker business listing Be the first listing in Lower Mount Walker Common questionsWhat is the postcode for Lower Mount Walker?Lower Mount Walker, QLD has the postcode 4340.What state is Lower Mount Walker in?Lower 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 Lower Mount Walker. Browse other postcodes in Queensland, or widen the search to every Australian postcode.