Home Postcode finder ACT Macarthur Macarthur postcode ACT Macarthur is a locality in Australian Capital Territory covered by postcode 2904. Postcode 2904 State or territory Australian Capital Territory (ACT) Region Canberra Add a free Macarthur business listing Be the first listing in Macarthur Common questionsWhat is the postcode for Macarthur?Macarthur, ACT has the postcode 2904.What state is Macarthur in?Macarthur is in Australian Capital Territory (ACT).Does postcode 2904 cover more than one suburb?Yes. Postcode 2904 covers 4 localities, so the postcode alone does not identify Macarthur. Browse other postcodes in Australian Capital Territory, or widen the search to every Australian postcode.