What is the Postal Code for South Australia?

South Australia does not have one postcode, but hundreds. South Australia is a state and postcodes divide the state up. Usually small towns fit into one post code, while larger towns would span multiple. The capital (Adelaide) has dozens, if not hundreds. All postcodes in South Australia start with 5xxx (where xxx is the rest of the postcode). The city centre of Adelaide is 5000. Check the Australia Post web site below under 'Web Links' to find the particular one you need.