Home Postcode finder QLD Mount Mackay Mount Mackay postcode QLD Mount Mackay is a locality in Queensland covered by postcode 4854. Postcode 4854 State or territory Queensland (QLD) Region North QLD Add a free Mount Mackay business listing Be the first listing in Mount Mackay Common questionsWhat is the postcode for Mount Mackay?Mount Mackay, QLD has the postcode 4854.What state is Mount Mackay in?Mount Mackay is in Queensland (QLD).Does postcode 4854 cover more than one suburb?Yes. Postcode 4854 covers 25 localities, so the postcode alone does not identify Mount Mackay. Browse other postcodes in Queensland, or widen the search to every Australian postcode.