Home Postcode finder TAS Marion Bay Marion Bay postcode TAS Marion Bay is a locality in Tasmania covered by postcode 7175. Postcode 7175 State or territory Tasmania (TAS) Region Tasmania Add a free Marion Bay business listing Be the first listing in Marion Bay Common questionsWhat is the postcode for Marion Bay?Marion Bay, TAS has the postcode 7175.What state is Marion Bay in?Marion Bay is in Tasmania (TAS).Does postcode 7175 cover more than one suburb?Yes. Postcode 7175 covers 2 localities, so the postcode alone does not identify Marion Bay. Browse other postcodes in Tasmania, or widen the search to every Australian postcode.