Home Postcode finder NT Gillen Gillen postcode NT Gillen is a locality in Northern Territory covered by postcode 0870. Postcode 0870 State or territory Northern Territory (NT) Region Adelaide Add a free Gillen business listing Be the first listing in Gillen Common questionsWhat is the postcode for Gillen?Gillen, NT has the postcode 0870.What state is Gillen in?Gillen is in Northern Territory (NT).Does postcode 0870 cover more than one suburb?Yes. Postcode 0870 covers 20 localities, so the postcode alone does not identify Gillen. Browse other postcodes in Northern Territory , or widen the search to every Australian postcode.