Home Postcode finder VIC Auburn Auburn postcode VIC Auburn is a locality in Victoria covered by postcode 3123. Postcode 3123 State or territory Victoria (VIC) Region Hawthorn Add a free Auburn business listing Be the first listing in Auburn Common questionsWhat is the postcode for Auburn?Auburn, VIC has the postcode 3123.What state is Auburn in?Auburn is in Victoria (VIC).Does postcode 3123 cover more than one suburb?Yes. Postcode 3123 covers 2 localities, so the postcode alone does not identify Auburn. Browse other postcodes in Victoria, or widen the search to every Australian postcode.