Home Postcode finder TAS Mount Seymour Mount Seymour postcode TAS Mount Seymour is a locality in Tasmania covered by postcode 7120. Postcode 7120 State or territory Tasmania (TAS) Region Tasmania Add a free Mount Seymour business listing Be the first listing in Mount Seymour Common questionsWhat is the postcode for Mount Seymour?Mount Seymour, TAS has the postcode 7120.What state is Mount Seymour in?Mount Seymour is in Tasmania (TAS).Does postcode 7120 cover more than one suburb?Yes. Postcode 7120 covers 19 localities, so the postcode alone does not identify Mount Seymour. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.