Home Postcode finder ACT Richardson Richardson postcode ACT Richardson is a locality in Australian Capital Territory covered by postcode 2905. Postcode 2905 State or territory Australian Capital Territory (ACT) Region Canberra Add a free Richardson business listing More business listings in Richardson Businesses in RichardsonRichardson Primary SchoolMay Gibbs Close · 02 62058200 Common questionsWhat is the postcode for Richardson?Richardson, ACT has the postcode 2905.What state is Richardson in?Richardson is in Australian Capital Territory (ACT).Does postcode 2905 cover more than one suburb?Yes. Postcode 2905 covers 7 localities, so the postcode alone does not identify Richardson. Browse other postcodes in Australian Capital Territory, or widen the search to every Australian postcode.