Home Postcode finder ACT Causeway Causeway postcode ACT Causeway is a locality in Australian Capital Territory covered by postcode 2604. Postcode 2604 State or territory Australian Capital Territory (ACT) Region Canberra Add a free Causeway business listing Be the first listing in Causeway Common questionsWhat is the postcode for Causeway?Causeway, ACT has the postcode 2604.What state is Causeway in?Causeway is in Australian Capital Territory (ACT).Does postcode 2604 cover more than one suburb?Yes. Postcode 2604 covers 3 localities, so the postcode alone does not identify Causeway. Browse other postcodes in Australian Capital Territory, or widen the search to every Australian postcode.