Home Postcode finder TAS Dairy Plains Dairy Plains postcode TAS Dairy Plains is a locality in Tasmania covered by postcode 7304. Postcode 7304 State or territory Tasmania (TAS) Region Tasmania Add a free Dairy Plains business listing Be the first listing in Dairy Plains Common questionsWhat is the postcode for Dairy Plains?Dairy Plains, TAS has the postcode 7304.What state is Dairy Plains in?Dairy Plains is in Tasmania (TAS).Does postcode 7304 cover more than one suburb?Yes. Postcode 7304 covers 29 localities, so the postcode alone does not identify Dairy Plains. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.