Home Postcodes by state SA 5159 Postcode 5159 5159 is the postcode for 4 localities in SA: Aberfoyle Park, Chandlers Hill, Flagstaff Hill and Happy Valley. Localities with postcode 5159Aberfoyle ParkSAChandlers HillSAFlagstaff HillSAHappy ValleySA Postcode 5159 State or territory South Australia (SA) Localities 4 Council area Onkaparinga Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5158 · Postcode 5160