Home Postcode finder QLD Argyll Argyll postcode QLD Argyll is a locality in Queensland covered by postcode 4721. Postcode 4721 State or territory Queensland (QLD) Region Central QLD Add a free Argyll business listing Be the first listing in Argyll Common questionsWhat is the postcode for Argyll?Argyll, QLD has the postcode 4721.What state is Argyll in?Argyll is in Queensland (QLD).Does postcode 4721 cover more than one suburb?Yes. Postcode 4721 covers 8 localities, so the postcode alone does not identify Argyll. Browse other postcodes in Queensland, or widen the search to every Australian postcode.