Home Postcodes by state SA 5097 Postcode 5097 5097 is the postcode for 3 localities in SA: Redwood Park, Ridgehaven and St Agnes. Localities with postcode 5097Redwood ParkSARidgehavenSASt AgnesSA Postcode 5097 State or territory South Australia (SA) Localities 3 Council area Tea Tree Gully Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5096 · Postcode 5098