Home Postcode finder TAS Osterley Osterley postcode TAS Osterley is a locality in Tasmania covered by postcode 7140. Postcode 7140 State or territory Tasmania (TAS) Region Tasmania Add a free Osterley business listing Be the first listing in Osterley Common questionsWhat is the postcode for Osterley?Osterley, TAS has the postcode 7140.What state is Osterley in?Osterley 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 Osterley. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.