Home Postcode finder TAS Cethana Cethana postcode TAS Cethana is a locality in Tasmania covered by postcode 7306. Postcode 7306 State or territory Tasmania (TAS) Region Tasmania Add a free Cethana business listing Be the first listing in Cethana Common questionsWhat is the postcode for Cethana?Cethana, TAS has the postcode 7306.What state is Cethana in?Cethana is in Tasmania (TAS).Does postcode 7306 cover more than one suburb?Yes. Postcode 7306 covers 20 localities, so the postcode alone does not identify Cethana. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.