Home Postcode finder TAS Holwell Holwell postcode TAS Holwell is a locality in Tasmania covered by postcode 7275. Postcode 7275 State or territory Tasmania (TAS) Region Tasmania Add a free Holwell business listing Be the first listing in Holwell Common questionsWhat is the postcode for Holwell?Holwell, TAS has the postcode 7275.What state is Holwell in?Holwell is in Tasmania (TAS).Does postcode 7275 cover more than one suburb?Yes. Postcode 7275 covers 12 localities, so the postcode alone does not identify Holwell. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.