Home Postcode finder QLD Mackay South Mackay South postcode QLD Mackay South is a locality in Queensland covered by postcode 4740. Postcode 4740 State or territory Queensland (QLD) Region Central QLD Add a free Mackay South business listing Be the first listing in Mackay South Common questionsWhat is the postcode for Mackay South?Mackay South, QLD has the postcode 4740.What state is Mackay South in?Mackay South is in Queensland (QLD).Does postcode 4740 cover more than one suburb?Yes. Postcode 4740 covers 50 localities, so the postcode alone does not identify Mackay South. Browse other postcodes in Queensland, or widen the search to every Australian postcode.