Home Postcode finder QLD Gairloch Gairloch postcode QLD Gairloch is a locality in Queensland covered by postcode 4850. Postcode 4850 State or territory Queensland (QLD) Region North QLD Add a free Gairloch business listing Be the first listing in Gairloch Common questionsWhat is the postcode for Gairloch?Gairloch, QLD has the postcode 4850.What state is Gairloch in?Gairloch is in Queensland (QLD).Does postcode 4850 cover more than one suburb?Yes. Postcode 4850 covers 34 localities, so the postcode alone does not identify Gairloch. Browse other postcodes in Queensland, or widen the search to every Australian postcode.