Home Postcodes by state SA 5660 Postcode 5660 5660 is the postcode for 2 localities in SA: Chilpenunda and Cungena. Localities with postcode 5660ChilpenundaSACungenaSA Postcode 5660 State or territory South Australia (SA) Localities 2 Council area Streaky Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5655 · Postcode 5661