Home Postcode finder QLD Sunnybank South Sunnybank South postcode QLD Sunnybank South is a locality in Queensland covered by postcode 4109. Postcode 4109 State or territory Queensland (QLD) Region Western Suburbs Add a free Sunnybank South business listing Be the first listing in Sunnybank South Common questionsWhat is the postcode for Sunnybank South?Sunnybank South, QLD has the postcode 4109.What state is Sunnybank South in?Sunnybank South is in Queensland (QLD).Does postcode 4109 cover more than one suburb?Yes. Postcode 4109 covers 5 localities, so the postcode alone does not identify Sunnybank South. Browse other postcodes in Queensland, or widen the search to every Australian postcode.