Home Postcode finder NT Cossack Cossack postcode NT Cossack is a locality in Northern Territory covered by postcode 0850. Postcode 0850 State or territory Northern Territory (NT) Region Darwin Add a free Cossack business listing Be the first listing in Cossack Common questionsWhat is the postcode for Cossack?Cossack, NT has the postcode 0850.What state is Cossack in?Cossack is in Northern Territory (NT).Does postcode 0850 cover more than one suburb?Yes. Postcode 0850 covers 6 localities, so the postcode alone does not identify Cossack. Browse other postcodes in Northern Territory , or widen the search to every Australian postcode.