Home Postcodes by state SA 5603 Postcode 5603 5603 is the postcode for 4 localities in SA: Arno Bay, Hincks, Verran and Wharminda. Localities with postcode 5603Arno BaySAHincksSAVerranSAWharmindaSA Postcode 5603 State or territory South Australia (SA) Localities 4 Council area Cleve; Mainly Cleve, partly Tumby Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5602 · Postcode 5604