Home Postcode finder TAS Lachlan Lachlan postcode TAS Lachlan is a locality in Tasmania covered by postcode 7140. Postcode 7140 State or territory Tasmania (TAS) Region Tasmania Add a free Lachlan business listing Be the first listing in Lachlan Common questionsWhat is the postcode for Lachlan?Lachlan, TAS has the postcode 7140.What state is Lachlan in?Lachlan is in Tasmania (TAS).Does postcode 7140 cover more than one suburb?Yes. Postcode 7140 covers 48 localities, so the postcode alone does not identify Lachlan. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.