Home Postcode finder ACT Downer Downer postcode ACT Downer is a locality in Australian Capital Territory covered by postcode 2602. Postcode 2602 State or territory Australian Capital Territory (ACT) Region Canberra Add a free Downer business listing Be the first listing in Downer Common questionsWhat is the postcode for Downer?Downer, ACT has the postcode 2602.What state is Downer in?Downer is in Australian Capital Territory (ACT).Does postcode 2602 cover more than one suburb?Yes. Postcode 2602 covers 7 localities, so the postcode alone does not identify Downer. Browse other postcodes in Australian Capital Territory, or widen the search to every Australian postcode.