Home Postcode finder TAS Trevallyn Trevallyn postcode TAS Trevallyn is a locality in Tasmania covered by postcode 7250. Postcode 7250 State or territory Tasmania (TAS) Region Tasmania Add a free Trevallyn business listing Be the first listing in Trevallyn Common questionsWhat is the postcode for Trevallyn?Trevallyn, TAS has the postcode 7250.What state is Trevallyn in?Trevallyn is in Tasmania (TAS).Does postcode 7250 cover more than one suburb?Yes. Postcode 7250 covers 16 localities, so the postcode alone does not identify Trevallyn. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.