Home Postcode finder QLD Mount Gardiner Mount Gardiner postcode QLD Mount Gardiner is a locality in Queensland covered by postcode 4705. Postcode 4705 State or territory Queensland (QLD) Region Central QLD Add a free Mount Gardiner business listing Be the first listing in Mount Gardiner Common questionsWhat is the postcode for Mount Gardiner?Mount Gardiner, QLD has the postcode 4705.What state is Mount Gardiner in?Mount Gardiner is in Queensland (QLD).Does postcode 4705 cover more than one suburb?Yes. Postcode 4705 covers 5 localities, so the postcode alone does not identify Mount Gardiner. Browse other postcodes in Queensland, or widen the search to every Australian postcode.