Home Postcodes by state SA 5174 Postcode 5174 5174 is the postcode for 2 localities in SA: Sellicks Beach and Sellicks Hill. Localities with postcode 5174Sellicks BeachSASellicks HillSA Postcode 5174 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 5173 · Postcode 5201