Home Postcode finder QLD Retro Retro postcode QLD Retro is a locality in Queensland covered by postcode 4723. Postcode 4723 State or territory Queensland (QLD) Region Central QLD Add a free Retro business listing Be the first listing in Retro Common questionsWhat is the postcode for Retro?Retro, QLD has the postcode 4723.What state is Retro in?Retro is in Queensland (QLD).Does postcode 4723 cover more than one suburb?Yes. Postcode 4723 covers 11 localities, so the postcode alone does not identify Retro. Browse other postcodes in Queensland, or widen the search to every Australian postcode.