Home Postcodes by state SA 5165 Postcode 5165 5165 is the postcode for 2 localities in SA: Christies Beach and Christies Beach North. Localities with postcode 5165Christies BeachSAChristies Beach NorthSA Postcode 5165 State or territory South Australia (SA) Localities 2 Council area Onkaparinga Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5164 · Postcode 5166