Home Postcode finder QLD Mount Coolum Mount Coolum postcode QLD Mount Coolum is a locality in Queensland covered by postcode 4573. Postcode 4573 State or territory Queensland (QLD) Region Sunshine Coast Add a free Mount Coolum business listing Be the first listing in Mount Coolum Common questionsWhat is the postcode for Mount Coolum?Mount Coolum, QLD has the postcode 4573.What state is Mount Coolum in?Mount Coolum is in Queensland (QLD).Does postcode 4573 cover more than one suburb?Yes. Postcode 4573 covers 7 localities, so the postcode alone does not identify Mount Coolum. Browse other postcodes in Queensland, or widen the search to every Australian postcode.