Home Postcodes by state SA 5600 Postcode 5600 5600 is the postcode for 13 localities in SA: Backy Point, Cultana, Douglas Point, Douglas Point South, False Bay, Fitzgerald Bay and 7 more. Localities with postcode 5600Backy PointSACultanaSADouglas PointSADouglas Point SouthSAFalse BaySAFitzgerald BaySAIron BaronSAMullaquanaSAPoint LowlySAPoint Lowly NorthSAPort BonythonSAWhyallaSAWhyalla PlayfordSA Postcode 5600 State or territory South Australia (SA) Localities 13 Council area Whyalla Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5583 · Postcode 5601