Home Postcodes by state TAS 7023 Postcode 7023 7023 is the postcode for Opossum Bay, TAS. Localities with postcode 7023Opossum BayTAS Postcode 7023 State or territory Tasmania (TAS) Localities 1 Council area Clarence Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 7022 · Postcode 7024