Home Postcode finder TAS Mount Field Mount Field postcode TAS Mount Field is a locality in Tasmania covered by postcode 7140. Postcode 7140 State or territory Tasmania (TAS) Region Tasmania Add a free Mount Field business listing Be the first listing in Mount Field Common questionsWhat is the postcode for Mount Field?Mount Field, TAS has the postcode 7140.What state is Mount Field in?Mount Field is in Tasmania (TAS).Does postcode 7140 cover more than one suburb?Yes. Postcode 7140 covers 48 localities, so the postcode alone does not identify Mount Field. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.