Home Postcodes by state SA 5700 Postcode 5700 5700 is the postcode for 8 localities in SA: Blanche Harbor, Miranda, Mundallio, Port Augusta, Port Augusta North, Port Augusta West and 2 more. Localities with postcode 5700Blanche HarborSAMirandaSAMundallioSAPort AugustaSAPort Augusta NorthSAPort Augusta WestSAPort PatersonSAWami KataSA Postcode 5700 State or territory South Australia (SA) Localities 8 Council area Port Augusta Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5690 · Postcode 5710