Home Postcode finder QLD Gumlu Gumlu postcode QLD Gumlu is a locality in Queensland covered by postcode 4805. Postcode 4805 State or territory Queensland (QLD) Region North QLD Add a free Gumlu business listing Be the first listing in Gumlu Common questionsWhat is the postcode for Gumlu?Gumlu, QLD has the postcode 4805.What state is Gumlu in?Gumlu is in Queensland (QLD).Does postcode 4805 cover more than one suburb?Yes. Postcode 4805 covers 7 localities, so the postcode alone does not identify Gumlu. Browse other postcodes in Queensland, or widen the search to every Australian postcode.