Home Postcode finder QLD Antigua Antigua postcode QLD Antigua is a locality in Queensland covered by postcode 4650. Postcode 4650 State or territory Queensland (QLD) Region Sunshine Coast Add a free Antigua business listing Be the first listing in Antigua Common questionsWhat is the postcode for Antigua?Antigua, QLD has the postcode 4650.What state is Antigua in?Antigua is in Queensland (QLD).Does postcode 4650 cover more than one suburb?Yes. Postcode 4650 covers 48 localities, so the postcode alone does not identify Antigua. Browse other postcodes in Queensland, or widen the search to every Australian postcode.