Home Postcode finder NT Cullen Bay Cullen Bay postcode NT Cullen Bay is a locality in Northern Territory covered by postcode 0820. Postcode 0820 State or territory Northern Territory (NT) Region Darwin Add a free Cullen Bay business listing Be the first listing in Cullen Bay Common questionsWhat is the postcode for Cullen Bay?Cullen Bay, NT has the postcode 0820.What state is Cullen Bay in?Cullen Bay is in Northern Territory (NT).Does postcode 0820 cover more than one suburb?Yes. Postcode 0820 covers 18 localities, so the postcode alone does not identify Cullen Bay. Browse other postcodes in Northern Territory , or widen the search to every Australian postcode.