Home Postcode finder TAS Middlesex Middlesex postcode TAS Middlesex is a locality in Tasmania covered by postcode 7306. Postcode 7306 State or territory Tasmania (TAS) Region Tasmania Add a free Middlesex business listing Be the first listing in Middlesex Common questionsWhat is the postcode for Middlesex?Middlesex, TAS has the postcode 7306.What state is Middlesex in?Middlesex 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 Middlesex. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.