Home Postcode finder TAS Detention Detention postcode TAS Detention is a locality in Tasmania covered by postcode 7321. Postcode 7321 State or territory Tasmania (TAS) Region Tasmania Add a free Detention business listing Be the first listing in Detention Common questionsWhat is the postcode for Detention?Detention, TAS has the postcode 7321.What state is Detention in?Detention is in Tasmania (TAS).Does postcode 7321 cover more than one suburb?Yes. Postcode 7321 covers 35 localities, so the postcode alone does not identify Detention. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.